MIL-DTL-83528_4, Connector Gasket, Geometry

MIL-DTL-83528/4 is a standardized family of EMI flange gaskets. The dimensions and materials are well defined by the MIL spec. Stockwell Elastomerics manufactures standard and custom EMI gaskets from Type B, QPL listed conductive rubber. These gaskets are capable of attenuating EMI noise as well as sealing out environmental conditions.

MIL-DTL-83528E Type B Material:
Silver-plated, aluminum-filled silicone capable of 100 dB of plane wave shielding effectiveness at 10 GHz with a continuous use temperature range of -55°C to +160°C.

Example PIN: M83528/004B001
M83528 – indicates the EMI / RFI family of conductive materials
004 – indicates the flange style
B – indicates the specific material type (B indicates Ag/Al filled silicone)
001 – indicates the size and exact dimensions of the conductive flange gasket

How are MIL-DTL-83528E Type B Gaskets made?
Stockwell Elastomerics manufactures EMI gaskets from a range of processes including, compression molding, waterjet cutting, tool-less flash cutting, and die cutting. These capabilities allow Stockwell Elastomerics to mold Type B EMI sheets and cut MIL-DTL-83528/4 gaskets with very little waste.

MIL-G-83528 Gasket Materials and Non-Mil Options
MIL-DTL-83528/4 points to Mil-G-83528 which defines material type and performance requirements. The mil spec can be restrictive from a  design perspective – for example, hardness is limited to 65 durometer or expensive conductive particles (silver) are required. For EMI applications not requiring MIL-G-83528 EMI materials, Stockwell offers non-mil spec EMI materials that have been third party tested per Mil-G-83528 for attenuation performance. Materials include softer EMI rubber for lower compression force, EMI gasket material with passivated silver/aluminum for better corrosion resistance and nickel graphite filled conductive rubber to reduce cost.

Domestic EMI Gasket Manufacturer
Stockwell Elastomerics is an ITAR registered, domestic EMI gasket manufacturer. All EMI gaskets, both molded EMI gaskets and cut EMI gaskets are produced at Stockwell Elastomerics’ Philadelphia, Pennsylvania location.

For more information about M83528/004B EMI gaskets or custom EMI gaskets, please contact Stockwell Elastomerics at 1-800-523-0123 or by email at

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