UNE-EN ISO 13229:2012
非压力应用的热塑性塑料管道系统 未增塑的聚(氯乙烯)(PVC-U)管道和配件 粘度值和 K 值的测定(ISO 13229:2010)
Thermoplastics piping systems for non-pressure applications - Unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings - Determination of the viscosity number and K-value (ISO 13229:2010)