Specialty Silicone Products (SSP) introduces a new EMI fluorosilicone and announce that this high-durometer, electrically-conductive elastomer is now part of the Defense Logistics Agency’s (DLA) Qualified Product List (QPL) for MIL-DTL-83528, Type C. The new product, SSP-2573-75, uses fluorosilicone as the base material and is filled with silver-plated copper particles. SSP-2573-75 is capable of 110 dB plane wave shielding effectiveness at 10 GHz, has a continuous use temperature range of -55°C to +125°C and resists solvents and jet fuels. Applications include EMI gaskets for military and aerospace applications.  

QPL-83528 EMI Gasket Material

In a letter dated December 13, 2021, the DLA informed SSP that SSP-2573-75 passed qualification testing and has been added to QPL-83528 for specific drawings and material types. The Notification of Qualification is VQH-22-036726. DLA, the combat logistics support agency for the U.S. Department of Defense, maintains a qualifying list of manufacturer parts numbers that meet the requirements of lettered sections within MIL-DTL-83528, a U.S. military detail specification for electrically-conductive gasketing materials that provide shielding against EMI.

MIL-DTL-83528, Type C EMI Silicone

Within MIL-DTL-83528, Type C materials are fluorosilicones that meet the following criteria:

•    filled with silver-plated copper particles

•    capable of 110 dB of plan wave shielding effectiveness at 10 GHz

•    have a continuous temperature range of -55°C to +125°C.

Shielding effectiveness is defined as the ability of an EMI gasket material to electrically bond a test cover panel to an enclosure flange such that the RF is attenuated by the factors specified in the standard.

Data Sheet Available

SSP-2573-75 has been tested to MIL-DTL-83528 and to several ASTM standards. For example, this EMI fluorosilicone has been tested to ASTM D412 for tensile strength and elongation percentage, and to ASM D792 for tear strength and specific gravity. A technical data sheet is available for download via SSP’s website.

How to Order SSP-2573-75

SSP-2573-75 is supplied as fully-cured conductive sheet stock, ready-to-mold compounds and continuous extrusion profiles. This conductive silicone elastomer is tan in color and Made in the U.S. at SSP’s Ballston Spa, N.Y., manufacturing facility.