Home / Standards / GB/T 38691-2020 GB/T 38691-2020 Active Testing method for specific surface area of petroleum refining catalysts 石油炼制催化剂比表面积测试方法 Standard Type GBT ICS 71.100.99 CCS G74 Status 现行 Issue Date 2020-03-31 Implementation 2021-02-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A