Home / Standards / GB/T 23456-2009 GB/T 23456-2009 Abolished Phosphogypsum 磷石膏 Standard Type GBT ICS 91.100.10 CCS Q62 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