SSP makes standard EMI waveguide gaskets in M83528 and EIA sizes from the electrically conductive silicones we make right here in the USA.Â
We also fabricate custom EMI waveguide gaskets for both non-military and application-specification challenges.
Compare our waveguide gasket materials to Parker Chomerics CHO-SEAL and Nolato Jabar.
Get quick lead times, low minimum order quantities, and a Certification of Analysis with every batch.Â
Specialty Silicone Products (SSP) manufactures high-performance EMI waveguide gaskets engineered to eliminate microwave and radio frequency (RF) energy leakage across waveguide flange interfaces. Designed for radar systems, satellite communications (SATCOM), aerospace electronics, and military defense networks, our waveguide gaskets provide dual performance: continuous electromagnetic attenuation and hermetic environmental sealing.
Manufactured in Ballston Spa, New York, at our ISO 9001:2015 and AS9100D certified facility, SSP’s EMI waveguide gaskets are cut or molded from conductive silicones and fluorosilicones. We offer standard WR-series dimensions, official MIL-DTL-83528/013 slash sheet specs, and custom geometries with low minimum order quantities (MOQs).
SSP produces EMI waveguide gaskets for standard rectangular and circular Electronic Industries Alliance (EIA) Waveguide (WR) sizes:
| Waveguide Size | Frequency Range (GHz) | Flange Style / Type | Common MIL-DTL-83528 Slash Specs |
| WR-28 to WR-42 | 18.0 – 40.0 GHz | Millimeter Wave / Ka-Band Flanges | M83528/013 (Custom Die-Cut) |
| WR-62 to WR-90 | 8.2 – 18.0 GHz | Ku-Band / X-Band Radar Flanges | M83528/013-001 to -010 |
| WR-112 to WR-187 | 3.95 – 10.0 GHz | C-Band / X-Band SATCOM Flanges | M83528/013-011 to -020 |
| WR-284 to WR-650 | 1.12 – 3.95 GHz | S-Band / L-Band High-Power Radar | M83528/013 Large Format |
Waveguide flanges demand precise volume resistivity and low contact resistance to prevent RF arcing and power loss across the joint.
SSP2529 (Nickel-Plated Aluminum / Silicone): QPL-listed under MIL-DTL-83528 Type B. Delivers >100 dB shielding effectiveness with lightweight galvanic compatibility for aluminum waveguide flanges.
SSP2486-70 (Silver-Plated Aluminum / Fluorosilicone): QPL-listed under MIL-DTL-83528 Type D. Engineered specifically for airborne radar and naval waveguide systems exposed to jet fuel, hydraulic fluids, and harsh solvents.
SSP2569-65 (Silver-Plated Copper / Silicone): QPL-listed under MIL-DTL-83528 Type A. Designed for high-power RF systems requiring maximum conductivity and attenuation (>110 db)
SSP502 Series (Nickel-Graphite / Silicone): Premium commercial-grade conductive elastomer providing high shielding attenuation (80to 100 dB) and superior resistance to galvanic corrosion at a lower material cost.
RF Power Leakage Prevention: High-frequency microwave energy traveling through a waveguide can escape through tiny gaps in mating flanges. SSP’s EMI waveguide gaskets maintain continuous contact across the flange face, eliminating RF arcing and insertion loss.
Environmental & Pressure Sealing: Prevents moisture, dust, and atmospheric pressure loss in pressurized waveguide feeds.
Die-Cut & Molded Precision: Available with raised sealing beads, alignment bolt holes, or custom inner aperture dimensions to preserve impedance matching.
An EMI waveguide gasket seals the mating junction between two waveguide flanges. It provides continuous electrical conductivity to block high-frequency microwave/RF energy leakage while simultaneously establishing an environmental seal against moisture and atmospheric pressure loss.
Yes. SSP manufactures QPL-listed conductive silicone and fluorosilicone materials compliant with MIL-DTL-83528 specifications, including slash sheet M83528/013 for waveguide flange seals.
Yes. In addition to standard EIA WR-series sizes, SSP die-cuts and flash-cuts custom waveguide flange gaskets directly from customer CAD files or technical drawings.