Closed cell sponge gaskets are used to prevent the flow of fluids and gases either into or out of an application. While closed cell sponge is an excellent sealing material, offering gap sealing, cushioning, and insulating properties, choosing the right material is key to achieving effective in-service performance.

What is closed cell sponge?

Closed cell silicone sponge contains nitrogen-filled cells or pockets within the material. The nitrogen-filled 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.

Closed cell silicone sponge is an interesting material. It possesses a high tensile and greater tear resistance, making it a more durable material that silicone foam. The material is highly flexible, meaning it can readily adapt to variety of shapes and contours. It also possesses non-stick properties and has good resistance to ozone and UV light. Natural, synthetic, or reclaimed rubber, together with organic or inorganic additives, can be used as the base material, to manufacture closed cell sponge and create the desired material properties.

Closed cell sponge gaskets

Closed cell sponge gaskets are often fashioned from EPDM, neoprene, or silicone compounds. Blended materials, where multiple compounds are combined together, extend the range of closed cell sponge materials with enhanced performance properties, such as superior resistance to chemical attack and abrasion. Because the range of available closed cell sponge materials is always increasing, buyers should always exercise care in choosing the right material to service their application. Factors that should be considered when selecting a closed cell sponge material for a gasket or sealing application include the following:

CRG supplies closed cell sponge gaskets manufactured from an extensive inventory of materials. Our experienced team can assist in the selection of the optimal material for your application. All gaskets we supply are manufactured on the latest production equipment, ensuring conformity to your specifications and requirements. All stages of production are controlled under our ISO 9001:2015 quality management system. To find out more about the closed cell sponge gaskets we can supply, please contact our sales team at


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