EPDM gaskets from Interstate offer excellent heat, ozone, water, and weather resistance. EPDM rubber is a good thermal and electrical insulator, but exhibits poor compatibility with petroleum products and concentrated acids. Often, custom EPDM gaskets are used outdoors for environmental sealing.

Interstate Specialty Products manufactures custom EPDM gaskets for medtech, scientific, electronics, and industrial applications. We use precision die cutting to convert sheets and rolls of EPDM rubber, and can achieve tight tolerances in a wide range of gasket sizes.

Do you need die cut EPDM gaskets, or custom EPDM seals produced via digital knife cutting? Are you looking for custom EPDM gasketing with a pressure sensitive adhesive (PSA) or other adhesive backing for ease of installation? Learn more about our gasket fabrication capabilities.

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What Is EDPM Rubber?

EPDM is ethylene propylene diene monomer, an extremely durable synthetic rubber with numerous advantageous characteristics. According to ASTM D-1418, a standard classification system for elastomers, EPDM is an M-class rubber.

Advantages of EPDM Gaskets

EPDM rubber gaskets provide reliable, long-term sealing in extreme weather conditions and across a wide range of temperatures. Compared to other rubber materials, EPDM offers excellent resistance against aging, wear, wind, weather, ozone, and ultraviolet light.

EPDM rubber is also color-stable, which means that EPDM gaskets won’t stain mating surfaces. EPDM seals also provides good electrical insulation. However, custom gaskets made of EPDM rubber are not recommended for contact with most oils, gasoline, halogenated solvents, and concentrated acids.

EPDM Gasket Material Types and Grades

Die cut EPDM gaskets are made of solid, sponge, or foam rubber materials. Each EPDM material has a distinct molecular structure. Physical properties such as hardness or durometer are important to consider. Solid EPDM gaskets are harder and typically more resistant to compression. EPDM materials are also categorized by grades such as commercial, FDA-approved, UL 94 flame-retardant, and peroxide-cured.

Solid, Sponge, and Foam Rubber EPDM Gaskets

Solid EPDM gaskets and sponge rubber EPDM gaskets are available in a range of durometers. Foam rubber EPDM is characterized by closed cells or open cells. Custom EPDM gaskets made of closed cell sponge rubber are used in HVAC systems, electrical enclosures, and door and window seals on cars. Die cut EPDM gaskets made of open cell sponge rubber are used in applications such as shock absorption and electrical insulation.

Commercial vs. Higher Grade EPDM Gasket Materials

Die cut gaskets made of commercial-grade EPDM provide good resistance to chemicals, ozone, weathering, and UV light. Typically, these EPDM gaskets are used in applications that require resistance to hot and cold water, saturated steam, and outdoor environments. Higher-grade EPDM materials offer enhanced properties, and may be recommended if a lower compression set is required.

UL 94 EPDM Rubber Gaskets

UL 94, an Underwriters Laboratories (UL) standard for flame resistance and fire safety, is also used with EPDM materials. UL 94 gaskets that are made of flame-retardant EPDM rubber meet UL burn tests such as V-0, V-1, and V-2 and are often halogen-free. Custom die cut gaskets made of UL-rated EPDM sponge rubber and EPDM foam rubber also provide good sealing and moderate-to-good cushioning.

Peroxide Cure and FDA Approved EPDM Gaskets

Die cut gaskets that are made of peroxide-cured EPDM rubber provide excellent resistance to aging, heat, and compression set. Typically, they’re used in applications with food, water, and/or steam. FDA-approved EPDM gaskets meet U.S. Food and Drug Administration (FDA) requirements for food contact applications and medical devices. Not all food-grade rubber gaskets are FDA-approved, however.

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