Home / Standards / GB/T 34178-2017 GB/T 34178-2017 Active Silica glass substrates for photomask 光掩模石英玻璃基板 Standard Type GBT ICS 81.040.30 CCS Q35 Status 现行 Issue Date 2017-09-07 Implementation 2018-08-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A