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Standards GB - Chinese national standards - Page 5742
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 12687.4-1990
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Chemical analysis of nitrate of rare earth for agriculture—Determination of mercury content—Flame atomic absorption spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12687.5-1990
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Chemical analysis of nitrate of rare earth for agriculture—Determination of chrome content-sys—Diphenyl carbazide spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12687.6-1990
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Chemical analysis of nitrate of rare earth for agriculture—Determination of lead and cadmium content—Flame atomic absorption spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12687.7-1990
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Chemical analysis of nitrate of rare earth for agriculture—Determination of thorum content—Spectrometric method with Cl-TBP levextred resin separation
WITHDRAWN published on 30.12.1990
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GB/T 12687.8-1990
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Chemical analysis of nitrate of rare earth for agriculture—Determination for the water insoluble matter content—Gravimetric method
WITHDRAWN published on 30.12.1990
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GB/T 12688.1-1998
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Styrene for industrial use—Determination of purity—Capillary gas chromatography
WITHDRAWN published on 13.7.1998
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GB/T 12688.1-2011
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Test method of styrene for industrial use—Part 1:Determination of purity and hydrocarbon impurities—Gas chromatography
WITHDRAWN published on 12.5.2011
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GB/T 12688.2-1990
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Styrene for industrial use--Determination of purity--Crystallizing point method
WITHDRAWN published on 30.12.1990
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GB/T 12688.3-1990
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Styrene for industrial use—Determination of content of polymer—Photometric method
WITHDRAWN published on 30.12.1990
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GB/T 12688.4-1990
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Styrene for industrial use—Determination of content of peroxides—Titrimetric method
WITHDRAWN published on 30.12.1990
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