Home / Standards / GB/T 3994 GB/T 3994 Active Insulating firebricks of aluminosilicate 粘土质隔热耐火砖 Standard Type GBT ICS 81.08 CCS Q42 Status 现行 Issue Date 2016-03-04 Implementation 2014-05-01 Responsible Dept N/A Drafting Unit N/A