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Finding the Right Conductive Elastomer EMI Gasket For You

  • Availability
  • Design Flexibility
  • Cost Effectiveness
  • Proven Performance

Four of the reasons why CHO-SEAL® conductive elastomer electromagnetic interference (EMI) gaskets are the right EMI shielding solution. Once used mainly to shield critical defense and aerospace electronic systems, Parker Chomerics conductive elastomers have become the progressive choice for designers of consumer, telecommunications, industrial equipment, automotive, medical devices and much more.

Conductive elastomers are reliable over the life of the equipment, and the same gasket is both an EMI shield and an environmental seal. Elastomer gaskets resist compression set, accommodate low closure force, and help control airflow. They’re available in corrosion-resistant and flameresistant grades. Their aesthetic advantages are obvious: almost any elastomer profile can be extruded or custom molded with modest tooling costs and short lead times for either prototypes or large orders.

Parker Chomerics offers hundreds of standard molded and extruded products, but we can can also take a customer-supplied design and deliver finished parts. Molded products provide moisture and pressure sealing and EMI/EMP shielding when compressed properly in seals, flanges, bulkheads, and other assemblies. Extrusions provide similar benefits and are also readily lathe-cut into washers, spliced, bonded, kiss-cut, or die-cut to reduce installation labor and to conserve material, resulting in a cost-effective alternative to other methods of EMI shielding and environmental sealing.

Product Features and Benefits:

  • Nearly any shape or design possible
  • Many different filler material options available
  • Cost effective while mantaining high performance
  • Available in corrosion-resistant and flame resistant grades

Step 1. Determine Binder Material

It's very important to understand the level oc chemical resistance your EMI shielding elastomer gasket will require. Below is an example table of common exposures and fluids our customers are exposed to. Generally, a silicone gasket will be the right choice, however, there will be times -- especially in military or high end settings where an EPDM gasket is necessary.

Exposure/Fluid Silicone Fluorosilicone EPDM
High Temp Excellent Good Fair
Low Temp Excellent Excellent Excellent
IRM 901 (ASTM No. 1) Oil Fair/Good Good Poor
Hydraulic Fluids Poor Poor Poor
Hydrocarbon Fuels Poor Good Excellent
Ozone, Weather Good Good Good
Super Tropical Bleach Poor Fair/Good Good
Dilute Acids Fair Good Good

Step 2. Determine Filler Material

Once you have determined the binder material that is appropriate for your application, it's time to determine the filler material. Our array of conductive elastomers offers true flexibility in selecting the appropriate material for a specific applications on the basis of cost and level of attenuation required. Price varies directly with shielding performance. Please view our Conductive Elastomer Engineering Handbook for further detail.

Material Filler Binder Shielding Corrosion
CHO-SEAL 6502 Nickel-Aluminum Silicone ★★★★★ ★★★★★
CHO-SEAL 6503 Nickel-Aluminum Fluorosilicone ★★★★★ ★★★★★
CHO-SEAL 1298 Silver-Aluminum Fluorosilicone ★★★ ★★★★
CHO-SEAL 1285 Silver-Aluminum Silicone ★★★★ ★★★
CHO-SEAL 1287 Silver-Aluminum Fluorosilicone ★★★ ★★★
CHO-SEAL 1215 Silver-Copper Silicone ★★★★★
CHO-SEAL 1217 Silver-Copper Fluorosilicone ★★★★★
CHO-SEAL S6305 Nickel-Graphite Silicone ★★★ ★★
CHO-SEAL 6370 Nickel-Graphite Silicone ★★ ★★
CHO-SEAL 6371 Nickel-Graphite Silicone ★★ ★★
CHO-SEAL 6308 Nickel-Graphite Silicone ★★★ ★★
CHO-SEAL 6330 Nickel-Graphite Silicone ★★
CHO-SEAL L6303 Nickel-Graphite Fluorosilicone ★★★ ★★
CHO-SEAL 1350 Silver-Glass Silicone ★★★★
CHO-SEAL 1310 Silver-Glass Silicone ★★★ ★★
CHO-SEAL 1273 Silver-Copper Silicone ★★★★
CHO-SEAL 1270 Silver-Copper Silicone
CHO-SEAL 1224 Silver Silicone ★★★★★★
CHO-SEAL 1221 Silver Fluorosilicone ★★★★★★
CHO-SEAL 1401 Silver Silicone ★★★★
CHO-SEAL 1239 Silver-Copper Silicone/Cu Mesh ★★★★
CHO-SEAL 1212 Silver-Copper Silicone ★★★★★
CHO-SEAL 6435 Silver-Nickel EPDM ★★★ ★★★
CHO-SEAL 6307 Nickel-Graphite EPDM ★★ ★★★
CHO-SEAL 6452 Nickel-Graphite EPDM ★★★ ★★★★
CHO-SEAL 6460 Nickel-Aluminum EPDM ★★★★ ★★★★★
CHO-SEAL V6433 Silver-Nickel Fluoro/Fluorocarbon ★★★ ★★★
CHO-SEAL S6600 Carbon Silicone