Home / Standards / GB/T 39950-2021 GB/T 39950-2021 Active Alumina ceramic heat radiating element for LED lamp LED灯用氧化铝陶瓷散热元件 Standard Type GBT ICS 31.220 CCS L92 Status 现行 Issue Date 2021-04-30 Implementation 2021-11-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A