Home / Standards / GB/T 4104-2017 GB/T 4104-2017 Active Determination of whiteness for zinc oxide produced by direct process 直接法氧化锌白度检验方法 Standard Type GBT ICS 71.060.20 CCS H21 Status 现行 Issue Date 2017-10-14 Implementation 2018-05-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A