Silicone made sponge rubber sheet has extensive applications in food processing and pharmaceutical fields. This rubber sheet contains gum based PMDS (polydimethylsiloxane). Composition of this sponge rubber sheet tends to expand post its heat curing process and forms closed cell sponge structure. This type of cell structure has watertight property, ozone and UV protection attributes. Rugged by nature, this rubber sheet is considered as ideal raw material for developing gaskets meant for outdoor application purpose. Black in color, this sealing sheet has standard density.