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Connector Gaskets


Connector gaskets provide EMI shielding, electrical conductivity, environmental sealing, and thermal management. Interstate die cuts combination EMI gaskets.

Connector gaskets protect electrical circuits against electromagnetic interference (EMI) or radio frequency interference (RFI). Because they contain metallic particles or metal wires, these elastomeric shielding gaskets are also electrically conductive. EMI shielding levels and electrical conductivity vary with fill materials, but all conductive shielding gaskets provide design flexibility, cost effectiveness, and proven performance.

Conductive shielding gaskets also provide environmental sealing and thermal management*. The elastomeric material, typically a silicone or fluorosilicone compound, determines whether the EMI gasket resists water or fuels. EMI gasket materials can also dissipate heat, or resist the spread of flame and fire. Thermal interface materials (TIMs) conduct heat instead of electricity, and include thermal pads.

Die Cut Connector Gaskets Die Cut EMI/ RFI Shielding Gaskets

Interstate’s precision die cutting capabilities mean tight part tolerances in low-to-high production quantities. In addition to converting sheets and rolls of conductive shielding gasket materials, we can apply pressure-sensitive adhesives (PSAs) for connector gaskets that are easy-to-install. By working with material partners such as Bergquist, Chomerics, Jabar, and Specialty Silicone Products, we can meet your specific requirements.

Soft Connector Gasket Materials and Particle Fills

Connector gasket materials are available in various durometers and contain different types of fills. For example, EMI gaskets made of 30-durometer silicones with silver-aluminum particles are a good choice for shielding applications that require more compression. Interstate can also die cut harder EMI gasket materials such as 80-durometer fluorosilicones that resist fuels and are filled with nickel-graphite particles.

EMI Shielding Gaskets for MIL-DTL-83528 (M83528)

Interstate Specialty Products die cuts EMI/RFI shielding gaskets from metal-filled silicones and fluorosilicones that meet the requirements of MIL-DTL-83528 (M83528), a U.S. military specification for electrically-conductive elastomers. This includes EMI gasket materials with a Qualified Product Listing (QPL) from the Defense Logistics Agency (DLA). Wire-oriented, Monel-filled elastomers also support precision die cutting.

Combination EMI Gaskets for UL-94 Flame Resistance

Connector gaskets made of particle-filled elastomers are sometimes called “combination EMI gaskets” because they’re more than just EMI shielding gaskets. For example, Interstate can die cut combination EMI gaskets made of particle-filled silicones that have been tested to UL-94 V1 parameters for flame resistance. UL enclosures, NEMA enclosures, and IP enclosures also have specific connector gasket requirements.

EMI Management Gaskets for Medical Devices 

Interstate can die cut EMI management gaskets that contain passivated metal particles for enhanced corrosion resistance. Silicone connector gaskets with passivated particles are a good choices for medical devices, which must resist corrosion in order to avoid adverse effects. EMI medical gaskets must also provide environmental sealing.

Silicone Flange Gasket Fabrication

Interstate’s expertise with connector gaskets includes silicone flange gasket fabrication. Typically, these conductive shielding gaskets are made from silicone compounds that resist high pressures, steam, or chemicals. Most silicone flange gaskets are square-shaped with bolt holes in each corner and a larger hole in the middle. Precision die cutting from Interstate supports highly-accurate silicone flange gasket fabrication.

Foam Connector Gasket Applications

Foam connector gaskets provide reliable sealing with excellent compression set resistance. Poron foam connector gaskets are a good choice for applications that need to prevent the ingress of dust and withstand light splashing. Silicone foam connector gaskets can resist a wide range of temperatures and offer excellent temperature stability. Importantly, they allow for proper compression under low-temperature conditions.

D-Sub Gasket Applications

Die Cut EMI/ RFI Shielding Gaskets

D-shaped subminiature gaskets are made of soft, electrically-conductive elastomers that provide EMI shielding and environmental sealing between connector flanges and mating surfaces. For a D-sub gasket, shell sizes vary and 9 to 50 pin arrangements are common. Like other types of connector gaskets, D-subminiature EMI gaskets can have an adhesive backing for ease of installation.

Bergquist Sil-Pad and Gap Pad Applications

Interstate also die cuts Sil-Pad and Gap Pad thermal interface materials from The Berquist Company**, now part of Henkel North America. Sil-Pad thermally conductive insulators are used instead of mica, ceramics, and greases in electronics applications. Gap Pad products provides a thermal interface between heat sinks and electronic devices for uneven surfaces with air gaps and rough textures.

Custom Connector Gaskets for Your Application

Do you need connector gaskets that provide EMI shielding, electrical conductivity, environmental sealing, and thermal management? Learn more about Interstate’s gasket fabrication capabilities, and how conductive shielding gaskets meet demanding requirements for sealing and EMI gasket insulation. For more information, contact us on-line or call (800) 984-1811.


*Properties and applications shown throughout this website are typical. Your specific application should not be undertaken without independent study and evaluation for suitability.

**Sil-Pad is a registered trademark and Gap-Pad is a trademark of The Berquist Company.