GB/T 4219.1-2008 工业用硬聚氯乙烯(PVC-U)管道系统 第1部分:管材 Plastics piping system for industrial applications - Unplasticized poly(vinyl chloride)(PVC-U) - Specifications for components and the system - Part 1: Pipes
Plastics piping system for industrial applications - Unplasticized poly(vinyl chloride)(PVC-U) - Specifications for components and the system - Part 1: Pipes