Closed cell silicone sponge is a core material type that CRG uses to fabricate a variety of products for customers. This material is a good choice in applications where sealing against the ingress of water and moisture is desired.

About Closed Cell Silicone Sponge

Closed cell silicone sponge is often referred to as “expanded silicone.” The material is produced when uncured gum silicone is cured at high temperature and allowed to expand to a pre-determined thickness. The term “closed cell” is used because, as the gum silicone cures and expands, it produces a cellular structure within the material where the cells are completely enclosed and non-interconnecting. The resulting sponge is relatively impervious to the transmission of water or moisture through its structure, hence its use in applications where a waterproof seal is desired.

Benefits of closed cell silicone sponge include the following:

CRG Closed Cell Silicone Sponge Products

CRG uses a variety of closed cell silicone sponges to fabricate a wide array of products, tapes and parts. Many of these products service applications in the general industrial, food production, medical devices, healthcare, automotive and mass transit, and other markets. Examples of products we have manufactured from closed cell silicone sponge include the following:

If you have an application that requires products fabricated from closed cell silicone sponge, consider CRG as your preferred source of supply. To find out more about how we can address your needs, please contact our sales department at


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