On the contrary, sponge rubber regularly commences with expandable rubber varieties like EPDM or neoprene. The rubber compound is then supplemented with a chemical blowing agent, which, upon heating, decomposes and releases gases. This process results in the enlargement from the rubber as well as formation of the sponge-like construction. https://rubberfoamsheets37159.blogproducer.com/40819934/the-2-minute-rule-for-rubber-foam-versus-sponge-rubber