MIL-DTL-83528 Type C
SSP2573-75 vs. CHO-SEAL 1217

EMI Shielding Fluorosilcone with Silver-Copper 

SSP2573-75 is high-durometer EMI fluorosilicone that is filled with silver-plated copper particles. This electrically conductive gasketing material is part of the Defense Logistics Agency’s (DLA) Qualified Product List (QPL) for MIL-DTL-83528C Type C. 

CHO-SEAL 1217 Offset

SSP2573-75 can be used instead of CHO-SEAL 1217. CHO-SEAL®  is a registered trademark of Parker Chomerics. SSP also makes other CHOSEAL offsets. SSP is not a Parker Chomerics distributor. We make our own EMI silicones at our Made in USA manufacturing facility and offer a Certificate of Analysis (COA) with every batch. 

MIL-DTL-83528 Type C 

MIL-DTL-83528 Type C 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 -55°C to +125°C.

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.

QPL 83528 EMI Gasket Material

SSP2573-75 has passed qualification testing and 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-83528.

SSP2573-75 is supplied as fully cured, conductive sheet stock; continuous extrusion profiles; and ready-to-mold compounds. This EMI shielding material is tan color.

EMI Shielding Effectiveness

SSP2573-75 has a typical shielding effectiveness of >110 dB at 20 MHz to 10 GHz (E-Field). Its volume resistivity (VR), a measure of an insulating material’s resistance to leakage current through its body, has a typical value of 0.002 ohm-cm.

Technical Information

Download the  data sheet for material specifications such as tensile strength, elongation percentage, tear resistance, specific gravity, thermal stability range, and electrical stability after break. The technical data sheet also provides volume resistivity after life testing for 48 hours and 1000 hours.