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Waveguide Seals
For effective EMI shielding and pressure sealing for choke, cover and contact flanges, Chomerics’ waveguide gaskets ensure low insertion, low flange leakage, maximum heat transfer and minimum outgassing. 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 CHO-SEAL 1239 sheet stock 0.027 in. (0.69 mm) thick, ±0.003 in. (0.08 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.
RF/pressure seals for waveguide cover flanges are also available in Gask-O-Seal™ form. Gask-O-Seal waveguide gaskets consist of thin metal retainers which incorporate elastomer seals on each side, and raised knurls which bite into flange surfaces to provide good electrical contact. For more information on Gask-O-Seal products, contact Parker Hannifin, Cleveland, OH, 1-800-272-7537 and ask for Gask-O-Seal catalog #OSD-6411.
Choke flange and grooved contact flange gaskets are molded from CHO-SEAL 1212 material, and are available with O- or D-cross sections.
Properties of CHO-SEAL 1212 and 1239 materials are shown in the table below.
Cover flange and flat contact flange gaskets are die-cut from CHO-SEAL 1239 sheet stock 0.027 in. (0.69 mm) thick, ±0.003 in. (0.08 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.
RF/pressure seals for waveguide cover flanges are also available in Gask-O-Seal™ form. Gask-O-Seal waveguide gaskets consist of thin metal retainers which incorporate elastomer seals on each side, and raised knurls which bite into flange surfaces to provide good electrical contact. For more information on Gask-O-Seal products, contact Parker Hannifin, Cleveland, OH, 1-800-272-7537 and ask for Gask-O-Seal catalog #OSD-6411.
Choke flange and grooved contact flange gaskets are molded from CHO-SEAL 1212 material, and are available with O- or D-cross sections.
Properties of CHO-SEAL 1212 and 1239 materials are shown in the table below.
| Specifications | CHO-SEAL 1212 | CHO-SEAL 1239 | ||||
| Type (Ref: MIL-G-83528) | K | G | ||||
| Volume Resistivity (ohm-cm, max) as supplied (w/o PSA) | 0.005 | 0.007 | ||||
| Hardness (Shore A ±5) | 80 | 80 ±7 | ||||
| Specific Gravity (±0.25) | 3.5 | 4.75 ±0.75 | ||||
| Tensile Strength psi (MPa), min. | 400 (2.76) | 600 (4.14) | ||||
| Elongation (percent, min/max) | 100 / 300 | 20 / NA | ||||
| Tear Strength (lb/in, min) | 40 | 70 | ||||
| Compression Set, 70 hrs. @ 100°C (percent, max | 35 | Not Applicable | ||||
| Low Temperature Flex, TR10 (°C, minimum) | –45 | Not Applicable | ||||
| Continuous Use Temperature Range (°C) | –55 to 125 | –55 to 125 | ||||
| Shielding Effectiveness (dB, min.) 200 kHz (H Field) 100 MHz (E Field) 500MHz (E Field) 2 GHz (Plane Wave) 10 GHz (Plane Wave) |
70 120 120 120 120 |
70 110 110 110 110 |
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| Electrical Stability (ohm-cm, max.) Heat Aging | 0.010 | 0.010 | ||||
|
0.010 0.005 |
0.010 0.007 |
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| Post Tensile Set Volume Resistivity | 0.010 | NA | ||||
| EMP Survivability (kA per in. perimeter) | >0.9 | >0.9 | ||||
