Home / Standards / GB/T 12215-1990 GB/T 12215-1990 Abolished Bauxite sand and flour for investment casting 熔模铸造用铝矾土砂、粉 Standard Type GBT ICS 91.100.20 CCS J31 Status 废止 Issue Date 1990-01-12 Implementation 1990-10-01 Responsible Dept 国家标准委 Drafting Unit N/A