Home / Standards / GB/T 2490-2018 GB/T 2490-2018 Active Bonded abrasive products—Hardness grade measurement 固结磨具 硬度检验 Standard Type GBT ICS 25.100.70 CCS J43 Status 现行 Issue Date 2018-07-13 Implementation 2019-02-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A