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Elasto Proxy's Sealing Solutions Blog

Elasto Proxy's Sealing Solutions Blog is the place for conversation and discussion about the design and manufacturing of rubber and plastic parts and products. In addition to regular content from Elasto Proxy, you'll hear from companies across the rubber and plastics industry.

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What’s the Difference Between Foam Rubber vs. Sponge Rubber?

Posted August 17, 2019 8:55 AM by Doug Sharpe

Did you know that there’s a difference between foam rubber and sponge rubber? Sure, the two terms are often used interchangeably. Unless you work in the rubber industry, the sponge next to your kitchen sink may seem similar to the foam mattress pad on your bed. After all, both are soft and compressible. Upon closer examination, however, saying that foams are identical to sponges is like saying that doing the dishes is the same as getting a good night’s sleep.

What’s different about foam rubber? And how does it compare to sponge rubber? The differences begin with ingredients and end with molecular structure. Foam rubber and sponge rubber also use different raw materials, chemical reactions, and production processes. Not all foam rubber is soft like your mattress pad either, and that enables applications for rigid foams in building and construction.

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Re: What’s the Difference Between Foam Rubber vs. Sponge Rubber?

08/17/2019 9:45 AM

Sponges grow in the sea...

...and foam comes from the mouth...

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Re: What’s the Difference Between Foam Rubber vs. Sponge Rubber?

08/17/2019 10:24 PM

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Re: What’s the Difference Between Foam Rubber vs. Sponge Rubber?

08/18/2019 8:32 PM

Both come from the sea; foam forms in the surf zone.

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Re: What’s the Difference Between Foam Rubber vs. Sponge Rubber?

08/18/2019 5:34 PM

Sponge came first.

Like the chicken.

Foam is used to support things..

Like the egg.

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Re: What’s the Difference Between Foam Rubber vs. Sponge Rubber?

08/19/2019 6:09 AM

My simplistic view is the foam is closed-cell (individual bubbles) - whereas sponge is open-cell (the bubbles are interconnected).

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