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Standards GB - Chinese national standards - Page 7284
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 2590.7-1981
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Zirconium and hafnium oxides--Determination of phosphorus content--Ascorbic acid reduced molybdoantimonyl phosphoric acid absorption photometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.8-1981
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Zirconium oxide--Determination ofhafnium oxide content--Emission spectrophotometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.9-1981
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Hafnium oxide--Determinationof zirconium oxide content--X-ray fluorescence spectrometric method
WITHDRAWN published on 7.6.1981
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GB 2591.1-1981
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Determination of iron content in bastnaesite concentrates
WITHDRAWN published on 1.1.1981
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GB 2591.2-1981
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Determination of niobium content in bastnaesite concentrates
WITHDRAWN published on 1.1.1981
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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WITHDRAWN published on 1.1.1981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
WITHDRAWN published on 1.1.1981
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GB 2591.6-1981
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Determination of barium content in bastnaesite concentrates
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GB 2591.7-1981
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Determination of fluorine content in bastnaesite concentrates
WITHDRAWN published on 1.1.1981
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