Home / Standards / GB/T 16399-2021 GB/T 16399-2021 Active Method for chemical analysis of clay 黏土化学分析方法 Standard Type GBT ICS 91.100.20 CCS Q32 Status 现行 Issue Date 2021-10-11 Implementation 2022-05-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A