Home / Standards / GB/T 42269-2022 GB/T 42269-2022 Active Determination of pore size for membranes—Gas permeation method 分离膜孔径测试方法 气体渗透法 Standard Type GBT ICS 71.040.99 CCS J77 Status 现行 Issue Date 2022-12-30 Implementation 2023-04-01 Responsible Dept 国家标准委 Drafting Unit N/A