The difference between open and closed cell foam

canadafoambymail2Written by Foam Factory, Inc.

Two of the most common types of foam in use today are open cell and closed cell foam. The choice of one or the other depends on the application.

In terms of creation, closed cell foam consists of trapped gas bubbles created during the foam’s expansion. During the curing of the foam, these gas bubbles are permanently trapped during the curing process. These trapped gasses increase the insulation capabilities of the foam. For this to work, the cured foam needs to be strong and of a medium density level in order to keep the gas bubbles trapped.

Open cell foam, on the other hand, is quite different. The blowing agent is not trapped. It escapes through holes formed during the curing process. These holes allow an interconnection of sorts allowing them to interlock. The holes and spaces in the foam act much like a sponge and hold normal air. These tend to be less dense than closed cell as trapped gas bubbles to not need to be held.

Open cell foam is used mostly for interior foam applications. They can also be used as soundproofing foam for movie and music rooms. They are also cheaper to make and use fewer resources during manufacture.

Closed cell is good for both interior and exterior projects. Although not used as a sound deadening foam, due to the higher strength and increased density, they are good for applications where structural strength is a requirement.


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