Home / Standards / GB/T 40279-2021 GB/T 40279-2021 Active Test method for thickness of films on silicon wafer surface—Optical reflection method 硅片表面薄膜厚度的测试 光学反射法 Standard Type GBT ICS 77.040 CCS H21 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 国家标准委 Drafting Unit N/A