ISO 13844:2000 塑料管道系统 用于硬聚氯乙烯管道的弹性密封环式承口连接件 负压下密封试验方法
Plastics piping systems - Elastomeric-sealing-ring-type socket joints of unplasticized poly(vinyl chloride) (PVC-U) for use with PVC-U pipes - Test method for leaktightness under negative pressure