Home / Standards / GB/T 44309-2024 GB/T 44309-2024 Active Porcelain slab 陶瓷岩板 Standard Type GBT ICS 91.100.25 CCS Q31 Status 现行 Issue Date 2024-08-23 Implementation 2025-03-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A