Home / Standards / GB/T 23452-2009 GB/T 23452-2009 Abolished Natural sandstone for building slab 天然砂岩建筑板材 Standard Type GBT ICS 91.100.30 CCS Q21 Status 废止 Issue Date 2009-03-25 Implementation 2010-01-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A