The main varieties of plastic modifier are chlorinated polyethylene (CPE), methyl methacrylate butadiene styrene copolymer (MBS), acrylonitrile butadiene styrene copolymer (ABS), EVA, ACR, acrylonitrile and butadiene random copolymer (NBR) and rigid particle, etc. plastic modifier mechanical properties are better than low density polyethylene, melting point is higher than low density polyethylene, about 126 136℃, its embrittlement is mainly used as a modifier of PVC, in order to improve the impact resistance of PVC.