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Standards GB - Chinese national standards - Page 7552
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 3257.22-1999
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Methods for chemical analysis of bauxite—Preparation of pre-dried test samples
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GB/T 3257.23-1999
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Methods for chemical analysis of bauxite—Determination of organic carbon content—Titrimetric method
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GB/T 3257.24-1999
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Methods for chemical analysis of bauxite—Determination of hydroscopic moisture in analytical samples—Gravimetric method
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GB/T 3257.3-1999
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Methods for chemical analysis of bauxite—Determination of silicon dioxide content—Molybdenum blue photometric method
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GB/T 3257.4-1999
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Methods for chemical analysis of bauxite—Determination of iron oxide content—Dichromate titrimetric method
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GB/T 3257.5-1999
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Methods for chemical analysis of bauxite—Determination of iron oxide content—Orthophenanthroline photometric method
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GB/T 3257.6-1999
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Methods for chemical analysis of bauxite—Determination of titanium dioxide content—Diantipyrylmethane photometric method
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GB/T 3257.7-1999
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Methods for chemical analysis of bauxite—Determination of calcium oxide content—Flame atomic absorption spectrophotometric method
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GB/T 3257.8-1999
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Methods for chemical analysis of bauxite—Determination of magnesium oxide content—Flame atomic absorption spectrophotometric method
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GB/T 3257.9-1999
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Methods for chemical analysis of bauxite—Determination of potassium oxide and sodium oxide content—Flame atomic absorption spectrophotometric method
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