When approaching the problem of electromagnetic compatibility (EMC) the electronic design engineer quite often considers it to be a secondary issue that can be dealt with once the device is working and, after all, it can be dealt with by putting a metal box around it!

Mechanical engineers who have to address the issue, however, are faced with constraints such as weight, cost, environmental performance and corrosion. So, unless both the electronics and mechanical engineers have up front visibility of each other's requirements, cost and time delays will be inevitable.

Let's consider the problem of an EMC sealing arrangement required to provide an IP67 seal on a box that is likely to be in a marine environment. The cabinet is to be made of aluminium alloy; the treatment is to be defined and the seal is made using O-rings in a groove and a cover which is to be bolted in position. Whilst the enclosure will not be on deck — and therefore not exposed directly to the sea - it will have to contend with difficult conditions. The cabinet is not to be opened often but should be easy to operate.

Traditionally, the solution would have been a gasket in a groove or even two, with the outer seal being a non-conductive rubber environmental gasket and the inner a conductive metal or metal filled rubber conductive gasket such as the CHO-SEAL type.

The arrangement, shown in Figure 1 which provides flexibility and robustness, has been the starting point for most environmental and EMC designs. The downside is the cost of the machining and the fact that it takes up a relatively large amount of space. If space is in short supply, the EMC seal is often required to handle the environmental issues.

This sort of solution has the advantage of requiring less machining, fewer parts and the gasket can be conductive on the inside and non-conductive on the outside. The disadvantage is that a dual material gasket such as the Parker Chomerics co-extruded elastomers as shown in Figure 2, or dual moulded materials can be expensive.

Even this solution may be required to reduce weight size and cost further, so we progress to small dispensed gaskets such as CHOFORM® located on a shoulder, which take up less than a quarter of the space required by the double O-ring solution while being asked to perform practically the same job. At this point, there is no non-conductive barrier between the EMC gasket and the environment. This immediately puts the gasket at risk of galvanic corrosion unless precautions are taken.

It can be seen from Figure 3 that the progression from what may have been a solution involving a wall thickness of around 12mm has been reduced to something that approaches 3mm or less with the resultant weight and cost savings. However, this comes at the expense of having to ensure better tolerances and flatness on the metalwork along with the possible risk of corrosion to both the cover and housing.

These problems can be mitigated by using a protective conversion coating on the metalwork and careful choice of the conductive fillers within the seal matrix to match the galvanic potentials of the interfaces as closely as possible. There is also the possibility of placing a similarly dispensed nonconductive bead outside of the EMI seal.

All of the solutions for the enclosure outlined above use a groove or a recess into or onto which the gasket is placed - primarily to ensure metal-metal contact and to provide a positive compression stop for the gasket. Even a groove is not always possible, some form of compression limiter is necessary in most cases. Using the gasket as the only electrical contact between the surfaces is not desirable.

While the arrangement can give satisfactory results and is sometimes the only option, it does mean that limited use is being made of the shielding that is inherent in the metal of the enclosure. This can provide 20dB or more of attenuation without an EMC gasket, depending on the design of the metalwork and the frequencies involved.

Remember that EMC gasketing is designed primarily for maintaining the continuity of the shield or Faraday cage around the device to be shielded. All other functions are secondary and may require the use of a specific seal.

In the example of the aluminium box, the first problem is which aluminium alloy or other material you should use. This often is constrained by how you intend to make your box and cover.

In the case of a fairly small box, it's possible to machine the cover and the enclosure from a solid block. In this case, a broad grade of aluminium alloy can be used. But not all types of aluminium are suitable for surface finishing treatments and they have significantly different physical properties and corrosion resistance. Typically for marine environments, a 5000 series or 6000 series (Aluminium Association designations) alloy would normally be considered along with a trivalent chromate conversion coating (hexavalent versions whilst still available, are non-preferred due to health and environmental concerns). The type and class of the conversion coating then needs to be specified: Mil-DTL-5541 and BS2437:2002 relate here.

Alternatively, the aluminium can be plated. This brings the possibility of galvanically matching the conductive material in the gasket. This is not always necessary but is desirable in cases where electrolytic contamination (salt fog) is likely.

This is because the electrolyte and the different metals form a galvanic cell, with the less noble metal - normally the aluminium structure — corroding or being damaged.

If the galvanic potentials of the metals are matched as closely as possible - a difference of 0.5V or less is recommended, preferably approaching 0.25V - corrosion in the target environment can be eliminated or minimised.

Unfortunately, when it comes to aluminium, matching the galvanic potential with conductive gasketing materials is difficult and requires an additional coating/plating to resolve the issue.

Nickel plate or a silver or copper based paint are typical finishes but these finishes also have their own issues; if damaged or applied improperly, they can accelerate the rate of corrosion.

Therefore, if mechanical designers are to ensure the reliability and performance of the EMI seal, they need to take into account the nature of the enclosure material, the types of protective finishes and the nature of the gasket material, as well as the environment, operating conditions, expected life and the level of shielding required.

If the correct choices are made at the outset of the project, they can reduce the time taken for approval of the final product and reduce overall costs, while ensuring the product meets the design criteria.

The wide range of gasket materials available from shielding companies such as Parker Chomerics, along with recent developments such as the sheet and fabricated parts using  CHO-SEAL 6502 and 6503  elastomers, has improved the options for the designer. However, with ever-increasing frequencies and the tendency for lighter, thinner and lower power devices mean that EMI shielding for electronic devices will continue to be a challenge for the foreseeable future.

Article contributed by Gerard Young, AMIMechE MIEEE, applications engineering team leader, Parker Hannifin, Chomerics Division Europe. This was originally published in Markt&Tecnik

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Increased emission restrictions are requiring engine manufacturers to conform to Euro 6 and Tier IV regulations to reduce exhaust leakage 80% or more. In order to achieve these new standards, engines with extreme temperatures coupled with a high amount of vibrational movement, need to have highly engineered sealing solutions. Applications with predetermined mating components cannot always be changed, so the need for a sealing solution with a similar coefficient of thermal expansion is needed.

Most heavy duty diesel engines can reach exhaust gas temperatures upwards of 1292°F(700°C) while subjected to constant vibrations. These engine vibrations can cause havoc when a seal needs to be maintained on the exhaust line. Vibrations from the engine cause rotation, cavity offsets, pivoting, and reciprocation which become difficult to seal against. Movement, pressure cycling and thermal cycling require an engineered solution to maintain a seal under extreme application conditions. With the use of custom engineering and advanced analysis techniques, Parker is able to create custom solutions for our customers’ most difficult applications.

Parker’s Air Duct Seals for Heavy Duty Engines are a single piece, easy to install metal design, providing lower leak rates than traditional labyrinth piston ring seals.

The continuous single-piece metal seal design is enhanced with the use of TriCom-HT™, Parker’s proprietary high-temperature, anti-wear coating. TriCom-HT™ provides superior wear resistance, protecting the Air Duct Seal from the detrimental effects of engine vibration and thermal cycling, resulting in 80% less leakage and extended seal life.

Our Air Duct Seal design fits tightly into the mating hardware, greatly reducing leak paths. Machined grooves are not required in the mating hardware, thereby lowering your manufacturing cost.

• Multiple component assemblies: Assemblies where vibration causes leakage, in gasses or another fluid medium. Also in assemblies where high temp sealing is an issue due to expansion/contraction of mating hardware at the higher temps.
• Gas Turbines: Where static elastomer or metal seals cause leakage issues at high temperatures.
• Vibration isolation applications: Where isolation seals fail to stop leakage due to vibration.
• Exhaust connection between:
  • EGR
  • EGR Cooler
  • Exhaust Pipes
  • Turbo Charger
  • Exhaust Manifold

Parker has been able to incorporate its design experience and knowledge of metal sealing technology and material science technology to create this solution. The Parker Air Duct Seal was designed with cost savings in mind and the patented design allows for value added one-piece out of the box installation, virtually eliminating complex sealing needs. Installation of the Air Duct Seal is simple, and requires only a press fit for both sides of the seal. Some key benefits are:

• Easy to install: The seal is designed to be a press fit install using a simple hand operated arbor press. The curved features allow for the Air Duct seal to move in the cavity while maintaining contact with the mating flanges. These features are also designed to allow for offset or misalignment issues.
• Single piece out of the box lower cost option - metal design: This is a single piece out of the box rigid sealing solution providing a value-add function for supply chain by reducing part count in the Bill of Materials. Also reduces overall installation time and effort, hence lowering procurement and assembly costs.
• Anti-wear coating: Parker’s proprietary coating, TriCom HT™, is comprised of a unique cobalt-nickel alloy matrix co-deposited with chromium carbide and MCrAlY particles to provide a wear and oxidation resistant system for prolonged use.  This coating is vitally important to ensure that the Air Duct Seal works as long as the end product’s life. For more information, see page D-64 and D-65 of CSS 5129.
• Lower leakage rates than incumbent sealing technology: The Parker Air Duct Seal has been bench tested and field tested to seal better than the competition as seen in the graph. This is also required to meet future emission standards and exceptional leakage requirements that other seals cannot.
• High temperature and vibration resistance: The solution can operate up to 1400°F (760°C) continuous and 1550°F (843°C) maximum temperature. The design also allows for resistance due to vibration in the engine or machine.
• High corrosion resistance for long life: The Air Duct Seal uses our proprietary TriCom HT™ coating which helps resist corrosion and is better oxidation and wear resistant, hence durable enough to last the life of the application.

​

For more information on this technology, available sizes or additional questions, please contact our applications engineering team at Composite Sealing Systems Advanced Products Business Unit at 203 239 3341.

This article was contributed by Vivek Sarasam, heavy duty mobile senior applications engineer, Engineered Materials Group.

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In the world of semiconductor manufacturing, performance requirements are driving circuit sizes smaller and smaller, causing increased sensitivity to wafer defects. In parallel, the number of manufacturing steps has also increased driving a need for improved tool utilization and leaving more opportunity for these defects to be introduced. Identifying and eliminating the sources of defects is a tedious but necessary process to improve wafer yield.

One very distinct source of defects are the seals within a fab’s tool. Plasmas involved in both deposition, etch and cleaning processes utilize aggressive chemistries that put even high-functioning perfluorinated sealing compounds to the test. Much room for improvement has been left in this industry with many seal materials still posing significant threats to defectivity or downtime despite being designed for low particle generation or etch resistance.

Parker’s UltraTM FF302 Perfluorelastomer has proven success in CVD and etch applications, putting this material at the top of its class.  Typically, seal materials for semiconductor applications are optimized for low particulation or extreme etch resistance, however, Ultra FF302 provides both attributes in one material.  Laboratory testing shows Ultra FF302 has lower erosion in aggressive plasma chemistries even when compared to today’s leading elastomeric materials (Figure 1 below shows comparison erosion levels of various etch resistant perfluoroelastmers after exposure to O2 plasma).

Figure 1 

Not only has Parker’s Ultra FF302 shown promising results in the laboratory, but it has also had major success within the fab. In one field use, a fabricator was experiencing notable etching of industry-leading seals during a High Density Plasma Chemical Vapor Deposition (HDP-CVD) process involving SiH4 deposition with NF3 and O2 plasma cleans. Use of competitive materials (Competitor I, Figure 2) resulted in severe degradation with roughly 20% of the seal volume eroding; after the same period, FF302 O-rings experienced no erosion even in the most aggressive locations of the tool. (Figure 2 below shows the cross-sectional view of various FFKM O-rings after a full PM (60k wafers) on an HDP-CVD process).

Figure 2 

If you are an equipment owner, you know this type of erosion is not unique to this fab alone.  As a matter of fact, Parker has seen this type of erosion across various fabs and various companies.

Resistance to any variety of etching of the sealing material is imperative. Physical and chemical etch often wears away the polymeric components of the elastomer, leaving behind organic or mineral fillers in a rough, abraded manner and dislodging larger particles. The successes of FF302-75 show its ability to resist the most aggressive etching and cleaning chemistries. For this very reason, more and more tool owners see Parker’s Ultra FF302 as a great solution for reducing the cost of ownership on the tools for which they are responsible.

For more information, visit Parker O-Ring & Engineered Seals Division online and chat with our experienced applications engineers.

This article was contributed by Nathanael Reis, applications engineer, Parker O-Ring & Engineered Seals Division. 

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As consumers demand faster processing speeds, high resolution pictures, and a longer battery life, mobile electronic devices such as smartphones and tablets require highly-populated PCBs to support their functionality and performance requirements, in an ever-increasingly competitive market space. So how do designers fit all those components on there, with zero (yes, read ZERO) tolerance for electromagnetic interference (EMI) issues? This is where your Tetris® high score finally becomes useful!

To eliminate potential EMI issues caused by densely-populated boards, PCB and semiconductor designers are investigating new ways of shielding semiconductor devices and PCBs. Traditional metal EMI shields are no longer an option, as they take up too much board space and therefore reduce the overall competitive functionality of the mobile electronic device.  

In contrast, advanced conductive organic coatings such as Parker Chomerics CHO-SHIELD 604 can be applied to semiconductor devices with minimal capital equipment investment. All the while still achieving a continuous high volume application process.

1. It saves PCB space by incorporating the EMI shield into the semiconductor device itself, increasing the mobile electronic device’s functionality and reducing the overall size of the final product
2. it simplifies the board design, reducing product cycles, cost, and helping OEMs realize revenue sooner

Another approach to tackling EMI issues at the package or board level in electronic mobile devices is by applying an organic absorber coating to the semiconductor package or PCB to absorb extraneous electromagnetic waves. Absorber coatings, such as the Parker Chomerics Absorber Coating 9101, are formulated to absorb electromagnetic waves at customer specific frequencies, and - because they are non-conductive - can be applied directly to PCBs already populated with semiconductor packages. These absorber coatings can be applied to the PCBs or sections of the PCBs to reduce unwanted EMI noise after board assembly.

1. They are non-conductive and don’t need to be electrically grounded to the PCB, simplifying or eliminating masking
2. They can address EMI issues on the PCB, in-between tightly packed semiconductor devices
3. They can be tuned to absorb EMI at customer specific frequencies
4. They can be applied at the end of a product design cycle 

Like conductive EMI shielding coatings, absorber coatings can be applied in a continuous high volume manufacturing environment with minimal capital equipment investment, making them a low cost, low risk solution for board or component level EMI issues.

Learn more about Parker Chomerics Package Level EMI Shielding Coatings here and click here for additional product information. 

This article was contributed by Jarrod Cohen, marketing communications manager, Chomerics Division.

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When it comes to the topic of utilizing elastomeric seals, it’s stereotypical to consider environmental sealing as one of the simpler categories of applications. Near-ambient pressure and temperature conditions and a lack of exotic or aggressive chemistries are the kinds of details that typically come to mind. However, throw in a curveball or two and suddenly the challenges posed can make finding a solution seem reasonably more intricate.

For instance, consider the potential challenges of sealing off a battery enclosure or other kind of electrical component. While this may seem like a simple issue of finding a material that seals against moisture or fluids found in open-air conditions, manufacturability also needs to be taken into consideration. Many electrical enclosures have particular spatial requirements, including those which involve seal housings that require low closure force or those with sharp corners that could damage more conventional seal designs like solid-profile O-rings. These kinds of conditions are becoming more and more frequent, especially considering the automotive market and its increasing share of electric vehicles, which involve a larger proportion of electrical components in a more compact arrangement for reduced weight. Add to this the fact that these batteries and other electrical components are becoming more elaborate and more expensive as a result, and the need for highly-effective protective sealing design becomes imperative. This is where Parker engineers can design products like picture frames gaskets and hollow profiles that are customized to unique requirements.

There are also industry standards for electrical enclosures that help ensure a seal material meets relevant requirements that might not be taken into consideration or well-understood by those outside the elastomer industry. For instance, the UL 50E standard evaluates the physical properties and volume swell requirements deemed necessary for a seal material to withstand the conditions in these applications. Parker has materials from the EPDM, nitrile, and silicone compound families that are certified under this standard.

Another set of industry standards that reveal the specialization of environmental sealing requirements are Ingress Protection (IP) Ratings, which rate sealing performance against both solid contaminates and various forms of water (the most strenuous ratings for sealing against solid contaminates - those most relevant for elastomeric seals - indicate prevention of dust contamination).  These ratings apply to the effectiveness of an entire assembly and not the material of a component specifically – this means each assembly must be assigned a rating on a case-by-case basis.

One example of an IP rating is IP65, which uses a special set of test requirements to evaluate designs for resistance to blasts from standard-pressure water jets. Another example is IP67, which rates sealing performance under water submersion conditions. Parker engineers can provide the design support necessary to ensure a system earns either of these two ratings in particular, as well as those that verify an assembly’s ability to prevent dust contamination from inhibiting performance.

To see how Parker engineers can provide environmental sealing solutions involving standards like these and many others, consult our Application Engineers or chat with us online. 

This article was contributed by Nathaniel Reis, applications engineer, Parker O-Ring & Engineered Seals Division. 

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Elastomer seals from Parker Prädifa meet the most exacting demands in a wide range of applications. Aside from the appropriate seal designs, the material properties of the seal compounds are crucial to ensuring that seals deliver the desired performance.

A key criterion for the storage period of elastomers is the time at which the product was vulcanized. Parker indicates the date of manufacture on the packaging bags: “1Qxx” stands for parts produced in the first quarter of the year 20xx. The recommended maximum storage period depends on the type of elastomer.
 

Recommended maximum storage period

Elastomer seals should preferably be used within the statutory liability period of 24 months.

The properties profile of an elastomer seal typically remains constant for years if the seal is properly stored. Improper storage conditions, on the other hand, can drastically reduce a seal’s potential shelf life due to a large number of influencing factors (see Figure). Ultimately, the seal will no longer be fit for use due to hardening, softening, permanent deformation, cracks, surface damage, etc.

To avoid this, Parker Prädifa, based on the DIN 7716 and ISO 2230 standards, recommends that the following information is observed for storage, storage periods and cleaning of elastomer seals:

The preferred storage temperature for elastomer products is +15 °C and should not exceed +25 °C. Accordingly, sources of heat such as radiators, boilers (minimum distance: 1 meter) or direct sunlight should be avoided. Temperatures should not drop below a maximum of -10 °C. As in this case, a stiffening of elastomer products occurs the seals should be handled with special care to prevent deformation. Chloroprene materials should not be stored below -12 °C.
 

It is important to ensure that the relative humidity in storage facilities is below 65%. Storage in humid rooms and condensation must be avoided. Neither should elastomer seals be stored in extremely dry conditions.

Elastomer seals must be protected against sources of light with a high UV content as they might be able to damage the products. Examples of light sources with a high UV content include intense artificial light or direct sunlight. Light-induced (photo) damage can be avoided by adequate application of UV filters to the window panes in the storage room. All types of radiation such as gamma or radioactive radiation must be avoided.

Generally, elastomer seals should be protected against circulating air by suitable packaging such as airtight containers. This is particularly important for very small seals with a large surface-to-volume ratio. Mercury vapor lamps, fluorescent light sources, electric motors – generally any device that is capable of producing ozone through sparks, electrical discharges or high-voltage fields – must urgently be avoided. Ozone is harmful to many elastomers so that storage rooms must be ozone-free. This also applies to organic gases as well as combustion gases as they are capable of producing ozone via a photochemical process.
 

Greases, oils and solvents may cause damage to elastomer seals. Therefore, it should be ensured that the seals cannot come into contact with these media in storage (unless packaged this way by the manufacturer).

Elastomer seals which are exposed to tensile or compressive strain, or other types of deformation, may be damaged. Cracking may occur. Therefore, the seals must be stored without being exposed to strain and deformation.

In addition to these recommendations, there are a few other aspects to be observed when storing elastomer seals:

• Elastomer products should not come into contact with metals such as iron, copper and manganese, as this may result in damage. The same applies to respective alloys such as brass and non-metals.
• Contact with materials containing plasticizers, such as PVC, must be avoided.
• Elastomer seals of various types (material, color,…) should be stored separately.

Generally, elastomer products should be checked to ensure their proper condition prior to installation. Negative changes due to improper storage can usually be detected by visual inspection. The main characteristics discernible in a visual inspection are:

• dirt deposits 
• cracks 
• hardening 
• softening 
• stickiness
• discoloration  

Elastomer seals should be cleaned swiftly using a clean cloth and lukewarm water.  Exceptions are fabric-reinforced elastomer seals. In this case, contact with water must be avoided. Gasoline, benzene, turpentine and similar substances are not suitable for use as cleaning fluids. 

Elastomer products must not come into contact with sharp-edged or pointed objects such as steel brushes, sanding paper, etc. Drying near radiators is not recommended.

Additional information:
Brochure: Storage and Cleaning of Elastomer Seals

www.parker.com/praedifa

Posted by Dr. Heinz-Christian Rost, technology & innovation manager, Prädifa Technology Division

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The competitive landscape, combined with government regulations, are driving technology in today's automotive market for improved efficiency and fuel economy. Any incremental improvement in fuel economy is strongly considered. Just a half mile per gallon may seem to be insignificant, but these projects are all taken very seriously. The entire vehicle is being examined for efficiency improvements; not just the engine. Anything that reduces weight or eliminates friction is a prime target for investigation. 

Recently, technological advances in the automatic transmission have been a big step in improving fuel economy. The "old" 5 and 6 speed transmissions are being replaced with more efficient 8, 9, and even 10 speed transmissions. The theory behind these new designs is providing the optimum gear ratio for the current acceleration condition. 

Increasing the number of speeds, however, also increases the number of clutches, components, fluid circuits, and potential friction locations within the transmission. Combined with the fact that the available space under the vehicle does not change, means all this has to be done within the same size transmission case. This has resulted in packaging challenges for the additional clutch packages within the transmission.

One critical component within the clutch assembly is the clutch piston itself. These pistons are energized by hydraulic fluid pressure with the assistance of elastomeric sealing elements. In addition to being a critical component in the function of the unit, each of these sealing elements is a source of friction in the transmission, thus directly impacting the overall efficiency of the vehicle. 

As important to the application of the clutch when needed, is the ability of the clutch to release when not in use. Return springs are used to retract these pistons. Lower force springs are being implemented to reduce the energy needed to apply the clutch, therefore lower drag seals are required to assure smooth, quick response time for the apply and retract cycles of the piston. These smaller springs also reduce weight and the space utilized. 

Automatic transmission clutch pistons are typically made from either steel stampings or cast aluminum. The configuration of these pistons and corresponding sealing elements are dictated by the available space within the mating components:

O-Rings

• Bi-directional radial compression seal
• Simplest assembly
• Minimal use of radial space

D-Rings

• Bi-directional radial compression seal
• Minimal use of axial space
• Reduced drag force compared to O-ring

Low Drag D-Rings

• Bi-directional radial compression seal
• Minimal use of radial space
• Significant drag reduction compared to D-ring

Lip Seal

• Unidirectional deflection seal
• Energized by fluid pressure
• Lower drag than compression seal designs

Bonded Piston Seal

• Elastomeric sealing lips bonded directly to the piston stamping
• Steel stamping reduces overall size of the piston
• Single piece assembly
• Low drag deflection lips

Parker Hannifin has the engineering design and manufacturing expertise to supply all clutch sealing configuration. Please contact one of our Applications Engineers to evaluate your specific needs and provide the optimal sealing solution for your application needs.

This blog was contributed by Scott Van Luvender, applications engineering manager, Automotive.

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We’re thrilled to announce the Chomerics Division of Parker Hannifin Corporation, the global leader in motion and control technologies, has received the prestigious Q1 certification from Ford Motor Company for its Fairport, New York location.

This Q1 certification is internationally recognized as an indication that Parker Chomerics has achieved excellence in quality performance, capable systems, warranty performance, and delivery performance. We are elated to display the Q1 designation with honor, as it is only given to Ford suppliers who can meet very stringent standards.

“I am proud of all of our Parker team members at Fairport and their contributions to achieve this goal,” said John Beswick, global business unit manager, Chomerics Division.

Specifically, Q1 Certification recognizes Chomerics Division for its ability to provide superior product quality, ensure high reliability, with exceptional materials and dependable supply chain management on an on-going basis.

“Congratulations to the Fairport team,” said Dave Hill, general manager for Chomerics Division, “It’s a direct reflection of Ford’s confidence in our operation, and of the hard work and dedication of our remarkable team members.”

Parker Chomerics Engineered Plastic Solutions business unit in Fairport, NY, located 10 miles outside of Rochester, NY, heavily utilizes robotics and automation to achieve high quality and delivery standards across many industries.

For more information on Chomerics products, visit our website or download our Engineered Custom Injection Molded Plastics Solutions brochure. 

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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EMI (electromagnetic interference) is the disruption of the operation of an electronic device when it is near an electromagnetic field in the radio frequency spectrum that is caused by another electronic device. When used with a conductive EMI gasket, conductive foil tapes with a polyester paint masking provides a conductive, non-corroding surface on painted metal electronic enclosures that forms and effective EMI shielding solution.

But sometimes, applying conductive EMI foil masking tapes can be tricky and quite the hassle. Luckily, we’ve come up with five easy steps to make applying conductive tape easy and worry-free.

To ensure maximum adhesion of your conductive foil tape with peel-off mask, remove all surface oils and dust. In large volume applications, proceed through your normal automated cabinet cleaning procedures. In small volume applications, clean cabinet flanges thoroughly with a cloth dampened with an industrial cleaner (acetone, toluene, or isopropyl alcohol).

Be sure to wear rubber gloves, because some cleaning agents tend to be nasty chemicals, and you do not want them to get on your skin. It is important to avoid contact with or handling of the adhesive on the back of the tape. Oils from the hand will affect adhesion. If oxidation or rust is present, abrade surface with sandpaper to expose clean metal before cleaning.

Still wearing your rubber gloves, peel away the release liner of the conductive tape and apply the tape to cabinet flanges, being careful to avoid wrinkles. Extend the tape beyond the corners and cut away excess. This prevents residual stress in the foil from lifting tape at ends. Run your finger along the mask to provide initial adhesion.

The excess tape in each corner should now be trimmed, and it is not necessary to overlap the tape in the corners. It is recommended that a gap be left between the vertical and horizontal strips. The gap should measure about .080 in. (2.0 mm) wide (which is equivalent to the recessed edge of the tape). Later, when paint is applied to the cabinet, this gap will be filled and serve to edge seal the tape ends.

Then, using a precise cutting tool, cut about a .080 in. (2.0 mm) piece of the mask layer on each strip and remove. This will further ensure edge sealing when the cabinet is painted.

Smooth over the surface of the conductive foil tape with a small rubber roller. Touch down the exposed tinned copper edges until they are flat and even. Note: Only moderate pressure is required (about 5 psi).

Now your cabinet is ready for normal phosphatizing and painting. Follow the manufacturer’s instructions for paint application and curing. Note: Recommended paint thickness, including primer, is 4 mils (0.1 mm) or more.

When the cabinet has reached room temperature, remove the mask of the conductive foil tape at a 180° angle from the foil tape leaving a clean, conductive grounding surface. The mask is easily removed at room temperature, with or without baking.

Looking for the perfect conductive foil tape with a peel-off mask? Check out Parker Chomerics CHO-MASK® II EMI Foil Tape now. CHO-MASK II tape provides
effective shielding performance and grounding points within the painted enclosure, and can accommodate a wide range of enclosure finishing processes, including powder coating.

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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Standard AS568 O-ring sizes are well known in the seal industry. Generally adding the compound with a standard O-ring size creates a smart part number for identification and purchasing purposes. But how do we come up with part numbers for seals that are different geometries, hollow profiles, or non-standard sizes? The Applications Engineering team wrestles with questions like these on a daily basis. There are generally three options for a custom sized part: precision cut, cord stock, and extruded and spliced parts.

Parker refers to our extruded and cut part product line as a Precision Cut. These parts are manufactured by pushing an elastomer material through a die to give it a specified inside diameter and wall thickness. The part would then be “cut” to a specified width (we call this the “cut thickness”). These parts have a square cross section, and are highly customizable with minimal capital costs. Parker specializes in custom precision cut lengths, and it is worth noting that TetraSeal® parts fall into this product category as well. If the ID and CS correspond to a standard AS568 size, these are sometimes referred to as a TS-xxx size (however, this will not be the final part number). The official Parker part number for both TetraSeals and custom precision cut parts cannot be determined prior to being quoted.

Another product that we often receive inquiries about is cord stock. This product line is manufactured by extrusion and the parts can have many different geometries. Cord stock is often used when a customer wants to create their own custom sized gaskets – doing a splice on their own. For extruded cord part numbers, Parker uses the below “smart” part numbering method:

Material – Profile – Packaging Method** – Material

Example:  A spool of 500 feet of S7442 in the A002 profile would have the Parker part number S7442 A002 S S7442.  The quantity would be 500.

With extruded/spliced parts, there is an additional step – splicing.  When given “developed length” which is the total length of the part along its centerline, the part is cut to that length and then undergoes a hot vulcanization process using the same base polymer, creating a continuous part. This can be done for both hollow profiles and solid profiles. For extruded and spliced parts, the below “smart” part numbering method can be used:

Material – Profile – Packaging Method** – Developed Length (centerline length*, where xxx.xx corresponds to the length in inches)

Example: A 37” inside diameter x 0.139” cross section part, made from E7736-70 would have Parker part number E7736 A018 D 11668

*The centerline length is calculated by taking the desired ID (37”) and adding 1 cross section width to it and multiplying by Pi.  (37” + 0.139”) * pi = 116.68”
** The different “packaging methods” are:
S: Spooled footage – This is a type of bulk packaging and the cord will come on a spool.
C: Coiled – This is another type of bulk packaging, and the cord will come coiled in a bag or box.
D: Developed Length (Spliced) – This type of package method is for spliced parts.  The finished parts will be coiled in a bag or box.

For more information on TetraSeals or other custom sealing solutions, visit Parker O-Ring & Engineered Seals Division and chat with an engineer today!

This article was contributed by William Pomeroy, applications engineer, Parker O-Ring & Engineered Seals Division. 

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Can electrically conductive plastics really replace traditional metal electronics enclosures? The answer is a resounding yes! There are very effective electrically conductive plastics available today that provide excellent electromechanical properties that help shield portable electronics from the electromagnetic interference (EMI) noise that is proliferating our daily life. Smart phones, Bluetooth, Wi-Fi, radio, even your television are all susceptible to EMI. So here are the key points you may want to consider when evaluating electrically conductive plastics for your application:

Every day we encounter EMI, and sometimes it happens at the most inopportune time. Maybe you’ve been put on hold for an hour and just when the customer service agent gets back to you, your cell phone drops the signal. Or perhaps you’re blasting the car radio listening to your favorite song, and just when the chorus comes on, static noise drowns out the tunes as you drive under high tension power lines. These are all examples of EMI interfering with our daily life, and electrically conductive plastics can help shield our portable devices from these interruptions.

When it comes to small portable electronics such as smart phones and other wireless devices, there is typically no more cost effective way to produce them than using injected molded conductive plastics. Metal housings often require additional rework after tooling, such as bending and threading, that injection molded plastics do not need.

Nowadays, smart phones and other small portable electronics such as life science devices are routine. Electrically conductive plastics allow these devices to remain lightweight and compact, all while providing critical EMI shielding performance to not interfere with the device’s performance.

Electrically conductive plastics can typically withstand everyday wear and tear better than many metal enclosures and metal PCB components. In a lab, conductive plastics can pass drop test after drop test with flying colors, which is not so easy to do with heavy metal enclosures.

Even if a conductive plastic housing gets dinged up, scuffs and scratches do not lead to corrosion susceptibility. Most conductive plastics can resist corrosion in harsh environments much better than metal can.

Conductive plastics are very effective given the correct applications. Given the shrinking nature of electronics devices, often you will save money going with conductive plastic over traditional metal because conductive plastics typically do not need additional machining such as adding threads, bending, etc. Given the right application, conductive plastics can be cost effective for smaller portable devices.

Be sure to work with a material provider that has extensive knowledge in the above areas and can support you on your design.

Discover the Parker Chomerics family of PREMIERTM Conductive Plastics for electronics enclosures today.

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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Every fall just outside of Detroit, MI, thousands of electric and hybrid vehicle industry insiders descend onto the Electric & Hybrid Vehicle Technology Expo in Novi, MI. Delivering the largest exhibition of electric vehicle and related industry suppliers in the nation, the Electric and Hybrid Vehicle Tech Expo offers a range of informative presentations, interactive events, and fun activities to help drive your projects to the next level.

Whether you're looking for electrical power-trains and components, battery management systems, thermal cooling materials or EMI shielding solutions, you’ll find it at all #EVT.

And this year didn’t disappoint – Parker Chomerics, in its second year of exhibiting, prominently featured a prototype urethane-based, 3.0 W/m-K dispensed thermal interface material (TIM) designed for high volume, EV battery applications requiring reliable thermal cooling performance. With an in-booth dispensing machine provided by PVA, show attendees were introduced to a different technology alternative than silicone dispensed TIMs.

Also, featured at the Parker Chomerics booth was an electric vehicle battery simulation, portraying what the compressed urethane TIM might look like in application against the battery cells and the cooling plate of the battery container. Depending on the manufacturer and design, some battery cells are arranged into a container which could be the size of a queen mattress, so proper wet out and adherence is critical to proper thermal cooling.

Parker Chomerics was also a featured speaker during the Thermal Management: Materials, Packaging & Performance track on Thursday, September 13th. Matthew Finley, global marketing manager of Parker Chomerics, took the viewing audience through an expert presentation focused on the differences between silicone and urethane dispensed thermal interface materials for EV applications.

Other technologies featured at this year's show included a variety of fluid seals, Press-In-Place (PIP) seals, o-rings, and molded shapes. Parker's innovative solutions for gearing and power transfer, battery life and electric motors can withstand a variety of environments, fluids, pressures, and temperatures. Sealing solutions for batteries require low compression set, temperature resistance, fire resistance, media resistance, low closure force and must be adaptable to a wide range of geometries.

Our team members were proud to represent Parker Chomerics at EVT18 and garner the opportunity to network with other professionals, engage with current partners, and nurture relations with future partners. We hope to see you again next year! 

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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Sealing can often be a frustrating challenge when dealing with flow batteries. Determining what materials are compatible with certain chemistries or developing a profile that provides optimal sealing under available compression can be a time-consuming task for those outside the sealing industry. A trial and error approach can have a significant overall cost impact through multiple prototype iterations, prolonged testing, and ultimately, delaying product commercialization. 

Parker’s design and material engineers can provide support to your team in the critical, early stages of product development. With hundreds of engineered elastomeric materials to choose from, our team can identify and recommend a compound that works with your specific electrolytes or other fluids. With the exceptionally long lifetime requirements of flow batteries, our homogeneous rubber provides the elasticity needed to handle the many charge-discharge cycles the battery will see in its life.

Our engineers can significantly reduce design time by utilizing finite element analysis early in the process. FEA is a sophisticated computer modeling program that demonstrates a visual simulation of how materials for a proposed seal design might perform in the application.  Material performance over a range of conditions is tested to see if the product will perform as expected. FEA can be repeated as many times as needed to fine-tune the design and make the final product as robust, functional, and reliable as possible. This process can be performed before prototyping, mold design or production is undertaken, greatly reducing the possibility of errors or redesign issues occurring later.

With continuous advancements materializing in the energy storage market, we fully understand the urgency of moving a product from development to commercialization. Parker can provide your team with resources to improve both the quality and speed of seal design in the critical prototyping stage, reducing overall cost.

After commercialization, Parker’s O-Ring & Engineered Seals Division can support your high volume production utilizing one of our 14 manufacturing locations dedicated to molding and extruding elastomeric products. To ensure the highest levels of material quality, state-of-the-art laboratories and testing equipment are housed in our two North American technology centers.

For more information, visit Parker O-Ring & Engineered Seals Division online and chat with our experienced applications engineers.

This article was contributed by Wesley Burcham, market manager, Parker O-Ring & Engineered Seals Division.

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For automotive engineers looking to reduce vehicle weight, metal-to-plastic conversion is a win-win. At the highest level, injection plastic molds are capable of producing multiples of millions of parts required for automotive programs with ease. Typically, a single tool can support a program for its entire life-cycle, meaning you only must go through the cost and design of tooling just once.

In traditional metal fabrication, you have stamping and die casting, both of which require tool refurbishment, at what can amount to a very significant cost. Although injection mold tooling can be relatively expensive, it is not more expensive than die cast tools and/or stamping tools.

Typically, injection molds will last many times longer than metal tooling. Injection mold tooling are also more flexible than other types of tools, allowing you to incorporate many types of features into a part so that no secondary machining, coating and/or forming is required after the molding operation. And depending on the type of plastic material you select; you can realize excellent strength to weight properties.

Metal has been used for decades now to machine and fabricate parts that need to last long past the product’s life cycle. Today, metal replacement parts, better known as metal-to-plastic replacement technology, offers a lighter, more cost effective solution that is often superior to the metal part it replaces.

Take for instance the cylinder head cover pictured. It has undergone a metal-to-plastic transformation, featuring multiple cable management mounts, coupled with the elimination of the spark plug tube mounting point, which has vastly decreased noise from the engine.

But most importantly, its weight has decreased 47% - a significant weight savings by automotive manufacturing standards.

Selecting the right injection molding plastic resource is critical, especially for companies that do not have in-house plastic expertise. Support engineers can ensure that the plastic part is properly designed for optimum molding capability, and look for opportunities to combine multiple parts into one, eliminating cost and manufacturing operations down the line. Plastic engineers can also support the design process with computer aided analysis, such as mold flow and finite element analysis (FEA).

Thermal Interface Materials (TIMs) are useful for thermal management in electronic components, as they enhance heat transfer from a heat-generating component to a heat dissipater, or heat sink. One important aspect when selecting a TIM for your application is knowing the material’s ability to transfer heat, which is often given by way of thermal conductivity and/or thermal impedance.

Across the industry, manufacturers often publish thermal conductivity in units of Watts / meter-Kelvin as well as thermal impedance in units of °C – inches2 / Watt on their datasheets. So, what is the difference between these two, and how should you consider them when selecting a TIM?

Thermal conductivity is a material property and describes the ability of the given material to conduct heat. Therefore, when a material’s thermal conductivity is high, the material is a better thermal conductor. This property is independent of material size, shape or orientation in a homogeneous material, and because of this, thermal conductivity is an idealized value.

To understand thermal impedance, we must first understand thermal resistance and thermal contact resistance.

• Thermal resistance is another inherent thermal property of a material, and is the measure of how a material of a specific thickness resists the flow of heat. Since TIM thickness is directly related to the resistance, thinner TIMs transfer heat more efficiently than thicker ones.
• Contact resistance is specific to the interfaces where a TIM meets the heat-generating component and the heat sink. In reality, neither of these components are perfectly flat or smooth, therefore these surface irregularities create micro-air voids when in contact with the interface material, reducing the effectiveness to transfer the heat (air is a very poor thermal conductor).

Therefore, the thermal impedance of a material is the sum of its thermal resistance and all contact resistances. When a material’s thermal impedance is lower, the material is a better thermal conductor in that application. Based on this, it is understandable that factors such as surface roughness, surface flatness, clamping pressure, presence of adhesive, non-homogeneous, and material thickness all have large impacts on the material’s thermal impedance. Thus, thermal impedance is a better “real world” thermal property, as it accounts for more variables specific to the application.

In summary, when comparing different TIMs for a specific application, you can begin with thermal conductivity for general comparisons, but having thermal impedance versus pressure data will be far more accurate to your “real world” conditions.

Pressure sensitive adhesive, more commonly known as PSA, is adhesive which forms a bond when pressure is applied, to join the adhesive with an EMI gasket. As the name "pressure-sensitive" indicates, the degree of bond is influenced by the amount of pressure which is used to apply the adhesive to the surface.

When it comes time to focus in on gasket electrical conductivity, it is generally not recommended to use PSA with an EMI shielding gasket. This is because the strip of adhesive inhibits true contact of the EMI shielding gasket with the mating surface, thereby decreasing the performance of the gasket. However, if a PSA system is deemed necessary, then the following guidance should be considered.

• Eliminates fasteners or other adhesives.
• Can function as a “third hand” to facilitate difficult installations.
• Available with silicones or fluorosilicones as a permanent attachment method.
• Quick stick – readily adheres to clean surfaces.
• Conformable adhesion to curved surfaces.
• Resists humidity, moisture, natural elements.
• Eliminates alternative RTV solvent emissions and long set-up times.

• Not available for round cross-sections, as there is little surface area to stick to.
• Not recommended for applications where solvent resistance is essential.
• Not recommended for applications where resistance to excessive abuse due to moving parts or traffic is required.
• Adds a shelf life to the sheet stock elastomer.
• Not available with EPDM binders.

Depending on how they are used, a PSA system may reduce the gasket through flange conductivity and/or shielding effectiveness to varying degrees.  Applications such as an EMI connector gasket which requires the lowest electrical resistance ground connection should not incorporate a PSA system.

Overall, the use of PSA as an attachment method for elastomer materials is meant to aid in initial assembly operations vs. a long term means of permanent attachment. Generally, you can expect the minimum deflection of the gasket may need to be increased to obtain desired shielding results.

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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There are many electromagnetic interference (EMI) shielding elastomer gasket mounting techniques that offer designers reliable, cost-effective choices in both materials and component assembly. These options offer aesthetic choices and accommodate packaging requirements such as tight spaces, weight limits, housing materials and assembly costs. Most EMI shielding elastomer gaskets attach using easily repairable systems. Take a look at the list we've compiled of the seven most common elastomer EMI shielding gasket mounting systems below.

This quick, efficient attachment strip offers superior flexibility in attaching molded elastomer sheets, cut parts, and extruded conductive elastomers. But beware, Parker Chomerics does not generally recommend the addition/use of pressure sensitive adhesive.

Friction fit in a grove prevents the over-deflection of the gasket. A retaining groove will be required to be designed into the application, and this mounting choice is ideal for molded and extruded conductive elastomers. 

Adhesive compounds are ideal for spot bonding non-conductive or conductive adhesive and are ideal for all conductive elastomer materials. It is important to select an adhesive suitable to adhere to either silicone or fluorosilicone, regardless of whether it is a non-conductive or conductive adhesive.

Form-in-place (FIP) automated technology such as Parker Chomerics CHOFORM® applies high-quality conductive elastomer gaskets to metal or plastic housings with robotic precision. FIP is widely used in compartmentalized enclosures and other tightly packaged electronic devices in military, telecom, transportation, aerospace, and life science applications.

Friction fit on tangs requires special design consideration, but it does accommodate thin walls and intricate shapes. 

Spacer gaskets are fully customized, integral spacers made from either conductive elastomer or plastic, and provide economical EMI shielding and grounding in small enclosures. Locator pins ensure accurate and easy installation, manually or robotically. 

Rivets or screw mounting requires integral compression stops and mounting holes on the flange.

For more information, visit Parker Chomerics Division or contact us directly.

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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Parker Chomerics is delighted to debut CHOFORM® 5575, an all-new form-in-place EMI gasket at electronica, the world's leading trade fair and conference for electronics. Located in Munich, Germany, electronica brings together nearly 80,000 visitors from 90 countries to discuss the industry’s latest market and technology topics.

CHOFORM 5575 is a silver-plated aluminum filled, electrically conductive form-in-place gasket. Form-in-place gaskets are dispensed using an automated system and provide reliable electromagnetic interference (EMI) protection for packaged electronic assembles. They are ideal when isolation and complex cross section patterns are required, such as on automotive advanced driver-assistance systems (ADAS) modules or telecommunications boxes.

CHOFORM 5575 brings exciting new technology, providing premier EMI shielding over a broad frequency range in high temperature environments up to 125° C (257° F).  CHOFORM 5575’s patented silver-plated aluminum filler technology allows for exceptional galvanic corrosion resistance when mated to an aluminum substrate, making this an ideal product for aluminum castings or airframes.

CHOFORM 5575 joins the family of Parker Chomerics CHOFORM dispensed form-in-place (FIP) EMI shielding gaskets, which are known to provide the lowest total cost of ownership for small cross section and complex pattern applications. From engine control modules (ECMs) to telecom infrastructure, to advanced avionic systems, CHOFORM is the designer’s first choice in form-in-place EMI gasket technology.

Be sure to visit Parker Chomerics at electronica, November 13-16, 2018 in Munich, Germany, in hall A2, stand 432 to see CHOFORM 5575, as well as the latest EMI shielding and thermal interface materials products from Parker Chomerics.

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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Parker Chomerics is delighted to debut CHOFORM® 5575, an all-new form-in-place EMI gasket at electronica, the world's leading trade fair and conference for electronics. Located in Munich, Germany, electronica brings together nearly 80,000 visitors from 90 countries to discuss the industry’s latest market and technology topics.

CHOFORM 5575 is a silver-plated aluminum filled, electrically conductive form-in-place gasket. Form-in-place gaskets are dispensed using an automated system and provide reliable electromagnetic interference (EMI) protection for packaged electronic assembles. They are ideal when isolation and complex cross section patterns are required, such as on automotive advanced driver-assistance systems (ADAS) modules or telecommunications boxes.

CHOFORM 5575 brings exciting new technology, providing premier EMI shielding over a broad frequency range in high temperature environments up to 125° C (257° F).  CHOFORM 5575’s patented silver-plated aluminum filler technology allows for exceptional galvanic corrosion resistance when mated to an aluminum substrate, making this an ideal product for aluminum castings or airframes.

CHOFORM 5575 joins the family of Parker Chomerics CHOFORM dispensed form-in-place (FIP) EMI shielding gaskets, which are known to provide the lowest total cost of ownership for small cross section and complex pattern applications. From engine control modules (ECMs) to telecom infrastructure, to advanced avionic systems, CHOFORM is the designer’s first choice in form-in-place EMI gasket technology.

Be sure to visit Parker Chomerics at electronica, November 13-16, 2018 in Munich, Germany, in hall A2, stand 432 to see CHOFORM 5575, as well as the latest EMI shielding and thermal interface materials products from Parker Chomerics.

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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The future of electronics are smart, safe, and secure thanks to technological advances in EMI shielding and thermal interface materials found at electronica.

Every two years in Munich, Germany, electronica, one of the world’s largest electronics trade fairs and conferences, brings together 3,100 exhibitors from over 50 countries, who provide insight into the future of electronics with their vast solutions and innovative products. The focal topics of this year’s electronica included blockchain, artificial intelligence and medical electronics solutions. With a 10% increase in visitors to over 80,000 from over 80 countries, electronica 2018 was bigger and more successful than ever before.

“No other event gives us as many ways to showcase Parker Chomerics to such a large and appropriate audience,” remarked Matt Finley, global marketing manager for Parker Chomerics. “We were able to debut our new form-in-place EMI shielding gaskets to an environment of people who are looking for the exact solutions we provide. For that alone, electronica is invaluable to us.”

Parker Chomerics, in its 5th year of exhibiting, prominently featured CHOFORM 5575 EMI shielding form-in-place gaskets, which are ideal for high temperature applications where galvanic corrosion is a concern. Chomerics also featured other EMI shielding solutions such as PREMIER conductive plastic, THERM-A-GAP GEL 30 dispensed thermal interface materials and more.

Also, featured prominently at the Parker Chomerics booth were EMI Shielding and thermal interface materials for medical devices and electric vehicles – all burgeoning markets for EMI shielding solutions.

Our team members were proud to represent Parker Chomerics at electronica 2018 and garner the opportunity to network with other professionals, engage with current partners, and nurture relations with future partners. We hope to see you again next time at electronica!

This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.

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