Home / Standards / GB/T 42657-2023 GB/T 42657-2023 Active Test method of temperature coefficient of infrared refractive index for infrared optical glass —Normal incidence method 红外光学玻璃红外折射率温度系数测试方法 垂直入射法 Standard Type GBT ICS 81.040.30 CCS Q37 Status 现行 Issue Date 2023-08-06 Implementation 2024-03-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A