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Standards GB - Chinese national standards - Page 5208
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB/T 7962.2-2010
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Test methods of colourless optical glass - Part 2: Optical homogeneity - Fizeau plano-interferometry
Standard published on 14.1.2011
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GB/T 7962.20-2010
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Test methods of colourless optical glass - Part 20: Density
Standard published on 14.1.2011
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GB/T 7962.21-2019
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Test method of colourless optical glass—Part 21Resistance to attack by aqueous alkaline solutions
Standard published on 30.8.2019
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GB/T 7962.22-2019
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Test method of colourless optical glass—Part 22Resistance to attack by aqueous alkaline phosphate-containing
Standard published on 30.8.2019
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GB/T 7962.23-2019
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Test method of colourless optical glass—Part 23: Resistance to climatic
Standard published on 30.8.2019
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GB/T 7962.3-2010
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Test methods of colourless optical glass - Part 3: Optical homogeity - Holographic interferometry
Standard published on 14.1.2011
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GB/T 7962.4-2010
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Test methods of colourless optical glass - Part 4: Temperature coefficient of refractive index
Standard published on 14.1.2011
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GB/T 7962.5-2010
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Test methods of colourless optical glass - Part 5: Stress birefringence
Standard published on 14.1.2011
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GB/T 7962.6-2010
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Test methods of colourless optical glass - Part 6: Young’s modulus,shear modulus and Poisson’s ratio
Standard published on 14.1.2011
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GB/T 7962.7-2025
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Test methods of colourless optical glass—Part 7: Extent of striae
Standard published on 30.6.2025
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