KS M ISO 21138-1-2008 非承压地下排水和污水用塑料管道系统.未增塑聚氯乙烯(PVC-U)、聚丙烯(PP)和聚乙烯(PE)结构壁管系统.第1部分:管道、配件和系统材料的规范和性能标准
Plastics piping systems for non-pressure underground drainage and sewerage－Structured-wall piping systems of unplasticized poly(vinyl chloride)(PVC-U), polypropylene(PP) and polyethylene(PE)－Part 1：Material specifications and performance criteria for pipe