(Chlorinated Polyvinyl Chloride) CPVC conforming to ASTM D-1784, Classification 23447-B, formerly designated Type IV, Grade 1, is a resin created by the postchlorination of a PVC polymer.
（氯化聚氯乙烯）CPVC符合ASTM D-1784，类别23447-B标准，以前定义为IV类别，等级1， 是由PVC聚合物进行后氯化处理后产生的一种树脂。
(Polyvinyl Chloride) PVC conforming to ASTM D-1784, Classification 12454-b, formerly designated Type I, Grade 1, is the most frequently specified of all thermoplastic piping materials.
(聚氯乙烯)PV C符合ASTM D - 1784，类别12454 - B标准，以前定义为类别i，等级1，是所有热塑塑料管道材料中应用最广泛的材料。
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