Home / Standards / GB/T 19421-2008 GB/T 19421-2008 Active Test methods of crystalline layered sodium disilicate 层状结晶二硅酸钠试验方法 Standard Type GBT ICS 71.100.40 CCS G72 Status 现行 Issue Date 2008-05-28 Implementation 2008-12-01 Responsible Dept 中国轻工业联合会 Drafting Unit 中国轻工业联合会