Home / Standards / GB/T 13020-1991 GB/T 13020-1991 Abolished Unplasticized polyvinyl chloride (PVC-U) pipes--Tolerances on outside diameters and wall thicknesses 硬聚氯乙烯(PVC-U)管材 外径和壁厚极限偏差 Standard Type GBT ICS 23.040.20 CCS G33 Status 废止 Issue Date 1991-07-03 Implementation 1992-04-01 Responsible Dept 中国轻工业联合会 Drafting Unit N/A