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| - Other plastic materials which can be used for manufacturing a 90??? retarder include poly(vinyl acetate), ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, poly(ethyleneterephthalate), vinyl polymers, acrylic polymers, polydienes, polyalkenes including polyethylenes, polyalkylene oxides, polyesters, polyamides, polysiloxanes and polyimides. 90??? retarder is also known as a quart
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