Home / Standards / GB/T 38949-2020 GB/T 38949-2020 Active Determination of pore size for porous membranes—Standard particle method 多孔膜孔径的测定 标准粒子法 Standard Type GBT ICS 71.040.01 CCS J77 Status 现行 Issue Date 2020-06-02 Implementation 2021-05-01 Responsible Dept 国家标准委 Drafting Unit N/A