Home / Standards / GB/T 20475.5-2020 GB/T 20475.5-2020 Active Classification for content of harmful elements in coal―Part 5:Fluorine 煤中有害元素含量分级 第5部分:氟 Standard Type GBT ICS 73.040 CCS D20 Status 现行 Issue Date 2020-03-06 Implementation 2020-10-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A