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· A Uniformly polished area is usually accomplished with fewer deep scratches in comparison with grindstones with shaft. Ethylene Propylene Rubber (EPM) is a copolymer consisting of ethylene and propylene. The ethylene propylene polymer is chemically inert because it consists of no double bonds. EPDM has an extra monomer extra https://beediadiamond.com/catalog/rubber-points
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