What is Cellular Rubber?

Cellular rubber is characterized by its porous and airy structure. Unlike solid rubber, cellular rubber does not have a dense composition, therefore, it cannot provide sufficient protective qualities. However, cellular rubber is ideal for insulation, sound dampening, and applications requiring a tight seal. Cellular rubber is made by introducing gases, such as nitrogen, into the material during its production process – this creates a lightweight and porous material. There are two forms of cellular rubber, closed cell and open cell, that are often used for different purposes due to their varying properties. Continue reading to learn more on the properties and applications of cellular rubber.

Closed Cell Foam

Closed cell foam is defined by its tight-knit structure of air pockets that create a slightly denser material. This tight-knit cellular structure is created by introducing gases to the rubber material while being under considerable pressure to form smaller and closely-knit air pockets. Due to its density, closed cell foam is relatively moisture-resistant and will not absorb moisture; however, because it is still a porous material, moisture left unattended will eventually permeate the foam. Closed cell foam is commonly used as seals and gaskets in sealing applications involving moisture.

Open Cell Foam

Open cell foam, as its name might suggest, is defined by its large pockets of air that create a very absorbent material. Open cell foam is an extremely permeable material that allows energy to diffuse within its porous matrix; however, it cannot be used in applications involving moisture. This is especially beneficial for applications, such as sound dampening. The energy of sound waves is absorbed into the material, then it is trapped within its structure eventually dissipating.

If you want to learn more on cellular rubber, check out our article on open and closed cell neoprene foam sheets! Find it here: https://www.rubbercal.com/sheet-rubber/foam-neoprene/