DIN EN 1401-1:2019
非压力地下排水和污水处理用塑料管道系统 未增塑聚(氯乙烯)(PVC-U) 第1部分:管道、配件和系统规范
Plastics piping systems for non-pressure underground drainage and sewerage - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes, fittings and the system