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Standards GB - Chinese national standards - Page 8754
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 7962.12-1987
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Colorless optical glass test methods Spectral internal transmittance
WITHDRAWN published on 25.5.1987
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GB/T 7962.13-1987
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Colourless optical glass test methods--Coefficient of thermal conductivity
WITHDRAWN published on 20.6.1987
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GB/T 7962.14-1987
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Colorless optical glass test methods Resistance to acid
WITHDRAWN published on 25.5.1987
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GB/T 7962.15-1987
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Colorless optical glass test methods Resistance to humidity
WITHDRAWN published on 25.5.1987
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GB/T 7962.16-1987
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Colorless optical glass test methods Linear thermal expansion coefficient and trasformation temperature
WITHDRAWN published on 25.5.1987
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GB/T 7962.17-1987
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Colorless optical glass test methods Least deviation angular test method for refractive index in the ultra violet and infrared wave band
WITHDRAWN published on 25.5.1987
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GB/T 7962.18-1987
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Colorless optical glass test methods Autocollimation test method for refractive index in the ultraviolet and infrared wave band
WITHDRAWN published on 25.5.1987
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GB/T 7962.19-1987
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Colorless optical glass test methods Relative lapping hardness
WITHDRAWN published on 25.5.1987
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GB/T 7962.2-1987
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Colorless optical glass test methods Test method by collimator for optical homogeneity
WITHDRAWN published on 25.5.1987
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GB/T 7962.20-1987
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Colorless optical glass test methods—Density
WITHDRAWN published on 25.5.1987
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