stmma lost foam casting expandable polystyrene eps polymethylhydrosiloxane hydrogen silicone oil cas63148-57-2 pmhs phmf methyl hydrogen silicone fluid foundry technology lfc process casting defects copolymer lost foam casting defects low carbon eps methyl hydrogen silicone oil hydrophobizator lost foam casting;expandable polystyrene;copolymer styrochem evanescent mode pattern raw material casting raw material evaporative-pattern casting styrofoam co-polymer epc casting gasifiable patterns castings castchem thermocole
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