Plastics piping systems — Unplasticized poly(vinyl chloride) (PVC-U) end-load-bearing double-socket joints — Test method for leaktightness and strength while subjected to bending and internal pressure
塑料管道系统——未增塑聚氯乙烯(PVC-U)端部承重双承插接头——承受弯曲和内部压力时密封性和强度的试验方法