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Standards GB - Chinese national standards - Page 7586
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 7962.17-1987
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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WITHDRAWN published on 25.5.1987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WITHDRAWN published on 25.5.1987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WITHDRAWN published on 25.5.1987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
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GB/T 7962.20-1987
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Colorless optical glass test methods—Density
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GB/T 7962.21-1987
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Colorless optical glass test methods—Knoop hardness
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GB/T 7962.22-1987
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Colorless optical glass test methods Temperature coefficient of refractive index
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GB/T 7962.23-1987
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Colorless optical glass test methods Young""s modulus, torsional rigidity modulus, Poisson""s ratio
WITHDRAWN published on 25.5.1987
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GB/T 7962.3-1987
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Colorless optical glass test methods Test method by holographic interference for optical homogeneity
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GB/T 7962.4-1987
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Colorless optical glass test methods Test method by multiple beam spherical interference for optical homogeneity
WITHDRAWN published on 25.5.1987
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