高密度聚乙烯 High density polyethylene    HDPE

高冲击强度聚苯乙烯 High impact polyethylene    HIPS

高分子量聚乙烯 High Molecular Weight Polyethylene    HMWPE

丁基橡胶(参见Butyl,PIBI) Brtyl Rubber,Isprene Isobutylene Copolymer(ASTM)    HR