Home / Standards / QB/T 1640-1992 QB/T 1640-1992 Abolished 陶瓷模用石膏粉物理性能测试方法 Standard Type QB ICS N/A CCS N/A Status Abolished Issue Date 1993-01-15 Implementation 1993-09-01 Centralized Committee 轻工业部 Issuing Authority 轻工业部