Home / Standards / GB/T 25808-2021 GB/T 25808-2021 Active Sulphur black 2BR、3B 200% 硫化黑2BR、3B 200% Standard Type GBT ICS 71.100.01;87.060.10 CCS G57 Status 现行 Issue Date 2021-12-31 Implementation 2022-07-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A