EPDM and Silicone Sponge Rubber

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EPDM and silicone sponge rubber are extremely flexible and customizable elastomeric materials that are great for use as seals and cushioning for nearly any surface. Sponge rubber can be formulated into several densities; low, medium, or high, to match the needs of your application.

Appropriately, sponge rubber is pliable enough to work in a wide variety of demanding environments, including high performance in a wide range of temperatures. These materials also perform well in applications where sound and vibration isolation are necessary.

Silicone sponge rubber

Benefits & Advantages

  • Controlled compression and recovery characteristics

  • Shock absorption attributes

  • Highly effective sealing capabilities

Compound Properties

  • Silicone sponge rubber

  • EPDM sponge rubber

  • Neoprene sponge rubber


  • Door seals

  • Sound and vibration isolation

  • Cushioning pads

  • Gaskets

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Sponge rubber parts can be formulated from a variety of materials. The following are examples of materials that can be adapted according to needs:

Closed Cell Sponge Rubber

Closed cell sponge rubber, or expanded rubber, is made of cells that are a lot like balloons. They hold in gas and don't allow moisture to penetrate their walls so long as the cell walls don't burst. The cells aren't interconnecting, so they don't allow air or water to wick through the sponge at low pressures.

Call Timco Rubber to learn more 1-800-969-6242
EPDM sponge rubber has excellent resistance to sunlight and weather. Image of the sun. Call Timco Rubber to learn more 1-800-969-6242

EPDM Closed Cell Sponge Rubber

  • Excellent resisting aging from weather and sunlight

  • Withstands adverse outdoor conditions better than neoprene

  • Will not meet UL flame ratings without the addition of a proper additive

  • Vulnerable to oils & fuels

Learn about EPDM rubber properties

Silicone Closed Cell Sponge Rubber

  • High temperature stability

  • Extreme temperature usage exposure from -100°F up to 500°F

  • Strong levels of resilience

  • Less flame resistant, usually can't achieve flame ratings beyond UL94HB

  • Resists degradation and aging due to sunlight and ozone exposure

Learn about silicone rubber properties

Neoprene Closed Cell Sponge Rubber

  • Most will meet UL94HF-1 flame rating requirements

  • Serviceable from temperatures from -40°F to 150°F of continuous exposure

  • Can withstand up to 200°F intermittently

  • Premium products will resist ozone, light oil contact, and acids & alkalis

Learn about neoprene rubber properties

Blended Closed Cell Sponge Rubber

  • Combination of Neoprene, EPDM, and SBR

  • Meets UL94HF-1 flame rating

  • Can withstand temperatures as low -70°F without cracking from cold embrittlement

  • Oil resistance not as good as 100% neoprene

  • Cost effective option

HVAC Market

  • Sound and vibration insolation

    • Deadening seal for doors, cabinets, etc.

Image of an oil field. Neoprene/SBR rubber blend sponge material is most commonly used for sealing out dust, dirt, and some liquids. Contact Timco for more information 1-800-969-6242

HVAC & Automotive Markets

  • Cushioning

  • Sponge gaskets

Fabricating processes available for all materials include:

  • Adhesive lamination

  • Slitting to width

  • Die cutting

Image of car motor. Sponge rubber is used in the automotive industry in cushioning and sponge gaskets. Contact Timco Rubber for more information.

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