Home / Standards / GB/T 13021-1991 GB/T 13021-1991 Abolished Determination for the carbon black content of polyethylene pipes and fittings by calcination and pyrolysis 聚乙烯管材和管件炭黑含量的测定 热失重法 Standard Type GBT ICS 83.040.20 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