sponge rubber

a light, spongy rubber, usually prepared by bubbling carbon dioxide through or whipping air into latex, used for padding, insulation, gaskets, etc.; foam rubber.


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So they filled the shell with sponge rubber and modified the design.
To seal the cut end of the bag, use sponge rubber to protect the bag from the
Neoprene sponge or vinyl foam is more durable than sponge rubber or
  polyurethane foam.
Sponge rubber, stone slab, linoleum and unglazed ceramic shall not be used in
  equipment construction.
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