Home / Standards / GB/T 4121-2014 GB/T 4121-2014 Active Test method for stability to thermal darkening of quartz glass 石英玻璃热变色性试验方法 Standard Type GBT ICS 81.040 CCS Q35 Status 现行 Issue Date 2014-07-24 Implementation 2015-03-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A