Parker Chomerics offers a selection of EMI gasket materials that provide effective EMI shielding and pressure sealing for choke, cover and contact flanges. Waveguides are used to transfer electromagnetic power efficiently from one point in space to another. Parker Chomerics waveguide gaskets ensure low insertion loss, low flange leakage, maximum heat transfer and minimum out gassing. We recommend CHO-SEAL® 1239 and 1212 conductive elastomers, as 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 sections. Please see the Parker Chomerics Waveguide Gaskets Datasheet for the material properties of both CHO-SEAL® 1239 and 1212. For applications in outdoor environments, contact Parker Chomerics Applications Engineering to discuss other CHO-SEAL® materials, e.g., CHO-SEAL® 1285 or 6502.

Features and Benefits:
• Customization offered for material and size requirements
• Excellent shielding effectiveness (>110 dB) across larger frequency range (100 MHz to 10 GHz)
• Gaskets are reusable and will not scar the flanges

CHO-SEAL® EMI shielded waveguide gaskets are available in standard flanges as follows:
1 - Die-Cut rectangular
2 - Die-Cut circular
3 - Molded rectangular, with “O” cross section
4 - Molded circular, with “O” cross section (O-rings)
5 - Molded circular, with “D” cross section (D-rings)
6 - Molded rectangular, with “D” cross section

Gaskets can also be custom designed to meet special requirements or less frequently used waveguide sizes (from WR 10 to WR 2300) and double-ridged waveguide.