Home / Standards / GB/T 3994-2013 GB/T 3994-2013 Active Insulating fireclay refractory bricks 粘土质隔热耐火砖 Standard Type GBT ICS 81.080 CCS Q42 Status 现行 Issue Date 2013-09-06 Implementation 2014-05-01 Responsible Dept 国家标准委 Drafting Unit N/A