elastomers

Cho Seal & Cho Sil

DESCRIPTION: Since 1961, Chomerics has invented and extended virtually every aspect of conductive elastomer materials technology from the earliest silver and silver/copper filled silicones to the latest and more cost-effective silver/aluminum and nickel/graphite composites. Today we offer the most comprehensive selection and highest quality products available anywhere. Each conductive elastomer consists of a silicone, fluorosilicone, EPDM or fluorocarbon-fluorosilicone binder with a filler of pure silver, silver-plated copper, silver-plated aIuminium, silver-plated nickel, silver-plated glass, nickelplated graphite, or unplated graphite particles.

The development of these composites is the result of decades of research and testing, both in the laboratory and in the field. Our proprietary filler powder technology allows us to carefully control the composition, size, and morphology of the conductive particles. Their precise, uniform dispersion within the resinous binders produces materials with stable and consistent electrical and physical properties. Chomerics’ conductive elastomers feature excellent resistance to compression set over a wide temperature range, resulting in years of continuous service. All meet MILSTD- 810 requirements for fungus resistance. In addition to EMI shielding, these materials will provide an environmental or pressure seal if required. For those materials containing silver, both packaging and storage conditions should be similar to those for other silver-containing components, such as relays or switches. They should be stored in sheet plastic, such as polyester or polyethylene, and kept away from sulfur-containing materials, such as sulfur-cured neoprene, cardboard, etc. To remove dirt, clean the elastomer with water or alcohol containing mild soap (do not use aromatic or chlorinated solvents). These materials are produced in a virtually unlimited variety of molded, die-cut and extruded shapes and sizes.
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Combo strip

DESCRIPTION:COMBO STRIP gaskets combine MESH STRIP gasketing in parallel with an
integral elastomer weather-sealing strip. They are available with or without adhesive backing in a broad range of standard cross sections. Configurations with MESH STRIP gasketing on both sides of the elastomer are also available.

COMBO STRIP gasketing is recommended for applications requiring a weather seal in addition to EMI/EMP shielding. This type of gasketing is also useful in applications requiring shielding only and where the adhesive backing on the elastomer would provide a convenient means of mounting. To obtain a reliable shield and seal, both portions of the COMBO STRIP gasket must come in contact with both mating surfaces.

For applications in which over-compression might cause deterioration of the elastomer seal, metal compression stops may be incorporated within the elastomer portion of the gasket. For high deflection applications with low closure force, COMBO gaskets with sponge elastomers are recommended. Mesh over elastomer core, in conjunction with a sponge elastomer, can further improve low closure force capabilities. For applicatoins requiring less compressibility, solid
elastomers are preferred..
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Conductive Elastomers

DESCRIPTION:Chomerics has invented and extended virtually every aspect of conductive
elastomer materials technology — from the earliest silver and silver/copper filled silicones to the
latest and more cost-effective silver/aluminum and nickel/graphite composites.

APPLICATIONS:
Roadside Assistance Systems
Cabinet Card Shielding
Entertainment Systems
Face Plate Shielding
Military/Aerospace
Antenna Systems
CATV Boxes
Commercial
Door Seals

CAPABILITIES:
Lightning Strike Resistance
water & static resistance
Corrosion Resistance
more compressible
fungus resistance
lighter in weight

PRODUCT RANGE: Each conductive elastomer consists of a silicone, fluorosilicone, EPDM or
fluorocarbon-fluorosilicone binder with a filler of pure silver, silver-plated copper, silver-plated
aIuminium, silver-plated nickel, silver-plated glass, nickelplated graphite, or unplated graphite
particles. 
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Grounding Tabs

DESCRIPTION:
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Pola strip/Polasheet

DESCRIPTION:POLASHEET and POLASTRIP gasketing are composite EMI shielding and weather sealing materials. Either solid or sponge silicone may be specified as the weather seal. In POLASHEET gasketing, individual monel or aluminum wires embedded in the silicone and oriented perpendicular to mating flange surfaces provide the EMI shielding. Wires are crimped for resiliency. Solid silicone POLASHEET gasketing is available with high-tack pressure-sensitive adhesive backing. In POLASTRIP gasketing, EMI shielding is provided by monel or aluminum knitted wire mesh embedded in silicone. POLASHEET and POLASTRIP gasketing with solid silicone weather seal are recommended for sealing under high pressure conditions. The  silicone seal is rated for use at temperatures from –70°F (–56.7°C) to +500°F (+260°C). Sponge silicone is used only for pressures below 5 psi (0.03 MPa) and for rain, drip, dust and ventilating air seals.
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Reinforced conductive seal

DESCRIPTION:CHO-SEAL reinforced conductive elastomer seals consist of a corrosion resistant
CHO-SEAL conductive elastomer base, reinforced with a woven or knitted fabric material. These seals are intended for use in airframe shielding applications. The integrally molded reinforcing material provides improved mechanical properties, resulting in seals which withstand high levels of wear and abuse, while maintaining the electrical properties of the conductive elastomer base material
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Sheet Stock and Die Cut

DESCRIPTION:

Sheet Stock: Almost every Chomerics commercial-grade elastomer material is available in sheet form. We are able to meet most requirements with the standard sizes and thicknesses.

Custom Die-Cut Parts: Custom parts can be die-cut by Chomerics or our Authorized Fabricators
from any standard sheet stock.
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Soft Shield

DESCRIPTION: