Written by Foam Factory, Inc.
Open and close cell foam are the two most used types of foam in the world today. Due to their nature, they are used in very different ways.
Closed cell foam is a strong, medium density foam that is buoyant enough to float. This is due to the gas bubbles trapped in the foam during manufacture. The trapped gas bubbles mean it will float and are also waterproof. This is the sort used for sort deadening foam. This is completely the opposite of open cell foam, in which the gas is blown through the foam during the curing process. The final texture is more akin to a sponge than to a strong foam. The curing process creates an interlocking series of holes.
In terms of application, closed cell foam is used for both indoor and outdoor uses. One type of use is for the water-based applications. It is perfect for floating cushions, life jackets etc. Interior projects could include cushions, movie rooms (as a sound proofing foam) etc. Open cell foam is used for interior projects. Due to its porous nature, it should not be used for any application that will have exposure to any water. The typical use cases are cushions, seat cushions and the softer layers of mattresses.
There are some cases where both types are used. Usually, when there are multiple layers and both comfort (open cell) and strength (close cell) are required.
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