Home / Standards / GB/T 31909-2015 GB/T 31909-2015 Active Permeable sintered metal materials—Determination of the air permeability 可渗透性烧结金属材料 透气度的测定 Standard Type GBT ICS 77.160 CCS H16 Status 现行 Issue Date 2015-09-11 Implementation 2016-06-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A