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Standards GB - Chinese national standards - Page 7250
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 2591.3-1981
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Determination of silicon dioxide content in bastnaesite concentrates
WITHDRAWN published on 1.1.1981
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GB 2591.4-1981
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Determination of calcium oxide content in bastnaesite concentrates
WITHDRAWN published on 1.1.1981
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GB 2591.5-1981
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Determination of thorium dioxide content in bastnaesite concentrates
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GB 2591.6-1981
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Determination of barium content in bastnaesite concentrates
WITHDRAWN published on 1.1.1981
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GB 2591.7-1981
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Determination of fluorine content in bastnaesite concentrates
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GB 2591.8-1981
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Determination of phosphorus pentoxide content in bastnaesite concentrates
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GB/T 25914-2010
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Information technology—Traditional Mongolian nominal characters,presentation characters and use rules of controlling characters
WITHDRAWN published on 10.1.2011
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GB/T 25915.1-2010
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Cleanrooms and associated controlled environments—Part 1:Classification of air cleanliness
WITHDRAWN published on 14.1.2011
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GB/T 25915.2-2010
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Cleanrooms and associated controlled environments—Part 2:Specifications for testing and monitoring to prove continued compliance with GB/T 25915.1
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GB/T 25915.3-2010
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Cleanrooms and associated controlled environments—Part 3:Test methods
WITHDRAWN published on 14.1.2011
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