Home / Standards / GB/T 40260-2021 GB/T 40260-2021 Active Test method for determining gas permeability of polymer membrane materials 高分子膜材料气体渗透性能测试方法 Standard Type GBT ICS 71.100.99 CCS G85 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 国家标准委 Drafting Unit N/A