Home / Standards / GB/T 7778-2017 GB/T 7778-2017 Active Number designation and safety classification of refrigerants 制冷剂编号方法和安全性分类 Standard Type GBT ICS 27.200 CCS J73 Status 现行 Issue Date 2017-05-12 Implementation 2017-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A