管材相关代号
PSP:PE-Steel-PE pipe 钢塑复合管
PAP:PE-Al-PE pipe 铝塑复合管
SP: steel pipe 钢管
PE:polyethylene 聚乙烯;
LDPE: low density polyethylene 低密度聚乙烯
HDPE:high density polyethylene 高密度聚乙烯
UHMW-PE:ultra high molecular weight polyethylene 超高分子量—聚乙烯
PEX:crosslinked polyethylene 交联聚乙烯
PE-RT:polyethylene with raised temperature resistance 耐热聚乙烯
PP:polypropylene 聚丙烯
PP-H:poly propylene homopolymer 丙烯共聚物(Ⅰ型)
PP-B:poly