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Standards GB - Chinese national standards - Page 7767
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 4581.1-1984
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Alunite ores--Analytical methods--General instructions
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GB 4581.10-1984
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Alunite ores--Determination of total iron content--Sulphosalicylic acid photometric method
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GB 4581.11-1984
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Alunite ores--Determination of titanium content--Diantipyrylmethane photometric method
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GB 4581.2-1984
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Alunite ores--Analytical samples--The methods of the sampling and preparation
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GB 4581.3-1984
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Alunite ores--Determination of hygroscopic moisture content in analytical samples--Gravimetric method
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GB 4581.4-1984
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Alunite ores--Determination of sulphur content for sulphate--Barium sulphate gravimetric method
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GB 4581.5-1984
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Alunite ores--Determination of aluminium content--Volumetric method
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GB 4581.6-1984
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Alunite ores--Determination of combined water content--Gravimetric method
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GB 4581.7-1984
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Alunite ores--Determination of potassium and sodium contents--Potassium tetraphenylborate gravimetric method and flame emission spectrophotometric methods
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GB 4581.8-1984
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Alunite ores--Determination of total sulphur content--Barium sulphate gravimetric method
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