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All expanded polyethylene foams have a process skin on once the raw material has been produced. Whether it is the extruded non cross-linked low density Stratocell and Ethafoam pe materials, chemically blown Microlen PE blocks, or the unique nitrogen gas-expanded cross-linked polyolefin foams of Plastazote and Evazote, in most cases, these skins need removing in order to work the materials further and to obtain the more refined and usable finish.
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