China National Standards

China 21：Resistance GB Standards List

  •  China "21：Resistance" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 7962.21-2019 Test method of colourless optical glass—Part 21：Resistance to attack by aqueous alkaline solutions
    无色光学玻璃测试方法 第21部分：耐碱稳定性    		 China National Standards
    21：Resistance
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