Parker Chomerics offers a selection of EMI gasket materials that provide effective EMI shielding and pressure sealing for choke, cover and contact flanges. Parker Chomerics waveguide gaskets ensure low insertion loss, low flange leakage, maximum heat transfer and minimum out gassing. Made from CHO-SEAL 1239 and 1212 conductive elastomers, the gaskets are reusable and will not scar flanges.
Cover flange and flat contact flange gaskets are die-cut from silver-plated copper filled silicone CHO-SEAL 1239 sheet stock 0.027 in. (0.69 mm) thick, ±0.005 in. (0.13 mm). Containing an expanded metal reinforcement to eliminate cold flow, these gaskets can be supplied with a slightly raised lip around the iris opening for high-pressure, high-power applications.
Choke flange and grooved contact flange gaskets are molded from CHO-SEAL 1212 silver-filled silicone elastomer material, and are available with O- or D-cross sec- tions. Properties of CHO-SEAL 1212 and 1239 materials are shown in Table 1. For applications in outdoor environmnets, contact Parker Chomerics Applications Engineering to discuss other materials, e.g., CHO-SEAL 1285 or 6502.