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Sponge Rubber Compound Properties

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.

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

Not sure if Sponge Rubber is the right material for your application?

Learn about common sponge rubber applications
View our rubber material selection guide

Find out if your application could benefit from using sponge rubber

Call 1-800-969-6242 to find out more, or get a quote.