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Standards GB - Chinese national standards - Page 8551
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 7239-1987
WITHDRAWN
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Method of testing the chromium film and photoresist thickness of chrome blanks
WITHDRAWN published on 1.1.1987
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GB 7240-1987
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Method of testing the surface reflectivity of chromium film on chrome blanks
WITHDRAWN published on 1.1.1987
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GB 7241-1987
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Method of testing optical density of chrome blanks
WITHDRAWN published on 1.1.1987
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GB/T 7242-1987
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Centering errors of lenses
WITHDRAWN published on 6.2.1987
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GB 7243-1987
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Test method for yarn hairness--Projection counting method
WITHDRAWN published on 1.1.1987
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GB 7247-1995
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Radiation safety of laser products, equipment classification, requirements and userguide
WITHDRAWN published on 1.1.1995
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GB 7247.1-2001
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Safety of laser products—Part 1:Equipment classification, requirements and user""s guide
WITHDRAWN published on 5.11.2001
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GB 7247.1-2012
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Safety of laser products—Part 1:Equipment classification and requirements
WITHDRAWN published on 31.12.2012
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GB/T 7247.13-2013
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Safety of laser products—Part 13:Measurements for classification of laser products
WITHDRAWN published on 17.12.2013
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GB/T 7247.14-2012
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Safety of laser products—Part 14:A user""s guide
WITHDRAWN published on 31.12.2012
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