SSP2571-85 is an 85-durometer (Shore A) shielding silicone that is filled with silver-plated copper particles and part of the Defense Logistics Agency’s (DLA) Qualified Product List (QPL) for MIL-DTL-83528C Type K.
SSP2571-85 has a typical shielding effectiveness of 140 dB at 20 MHz to 10 GHz (E-Field) and has been independently tested for shielding effectiveness by DLS Electronics Systems, which also tested SSP-2571-85 for electromagnetic pulse (EMP) survivability.
MIL-DTL-83528C Type K covers high-durometer silver-plated, copper-filled silicones capable of 110 dB of plane wave shielding effectiveness at 10 GHz with a continuous temperature range of -45°C to +125°C.Â
This U.S. military specification defines shielding effectiveness as the ability of an EMI gasket material to electrically bond a test cover panel to an enclosure flange such that the radiated radio frequency (RF) through a 24-in. x 24-in. (61-cm x 61-cm) is attenuated by the factors specified in the standard.
SSP2571-85 has passed qualification testing and has been added to QPL-83528 for specific drawings and material types. DLA, the combat logistics support agency for the U.S. Department of Defense (DoD) maintains a qualifying list of manufacturer part numbers (PNs) that meet the requirements of MIL-DTL-83528C.Â
SSP2571-85 is supplied as fully cured, conductive sheet stock; continuous extrusion profiles; and ready-to-mold compounds. This EMI shielding material is tan color.
SSP2571-85 can be used instead of CHO-SEAL 1287 and CHO-SEAL 1298. CHO-SEAL®  is a registered trademark of Parker Chomerics. SSP also makes other CHOSEAL offsets.
SSP2571-85 has a typical shielding effectiveness of greater than 140 dB at 20 MHz to 10 GHz (E-Field). Its volume resistivity, a measure of an insulating material’s resistance to leakage current through its body, has a typical value of 0.0006 ohm-cm.Â
For these and other product specifications, including material properties such as tensile strength, download SSP’s technical data sheet (TDS). Specialty Silicone Products has also made the Shielding Effectiveness & EMP Survivability Test Report available from its website.
