This premium addition-cure silicone rubber is filled with conductive particles—such as silver-plated copper, nickel-graphite, or pure silver—to provide superior electromagnetic interference (EMI) and radio-frequency interference (RFI) shielding in demanding aerospace, military, and telecommunications applications. It combines the environmental sealing properties of silicone with conductive performance that meets strict attenuation requirements.
The uncured compound can be formulated as a dispensable paste, a form-in-place gasket (FIP) liquid, or a calendered sheet for die-cutting, depending on manufacturing needs. Its rheology is engineered for precise bead application with robotic dispensing systems, creating consistent gasket profiles on enclosure flanges and connector shells. Cure takes place at room temperature within a few hours, or rapidly at elevated temperatures (15 minutes at 120°C), making it compatible with high-volume assembly lines.
Upon curing, the silicone reaches a Shore A hardness of 50–70 and delivers volume resistivity below 0.01 Ω·cm, translating to shielding effectiveness of 80–120 dB across frequencies from 30 MHz to 10 GHz. The elastomer maintains a continuous conductive path even when compressed to 20–50% of its original thickness, ensuring long-term sealing against dust, moisture, and electromagnetic leaks. Its closed-cell structure or solid consistency (as required) prevents fluid migration and meets IP67/IP68 sealing standards when properly designed into the groove.
Critically, this conductive silicone retains its shielding properties after repeated compression cycles, thermal aging, and exposure to salt spray and aviation fuels. It adheres well to metal enclosures with the appropriate primer, eliminating the need for separate adhesive backings in many installations. It is available in both tin-catalyzed and platinum-catalyzed versions, with the latter offering no post-cure blooming and superior long-term stability. For engineers designing ruggedized electronics, shielded control units, or high-integrity radio housings, this EMI silicone gasket material provides a reliable, all-in-one environmental and shielding solution.
