Home / Standards / GB/T 38940-2020 GB/T 38940-2020 Active Precision expansion alloys for sealing to silicon and silicon components 硅组件用精密封接合金 Standard Type GBT ICS 77.140.99 CCS H58 Status 现行 Issue Date 2020-06-02 Implementation 2021-01-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A