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Standards GB - Chinese national standards - Page 8259
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 5070.3-2002
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Chemical analysis of magnesia chromite refractories—Part 3:Determination of iron oxide—O-phenanthroline photometric method
WITHDRAWN published on 31.12.2002
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GB/T 5070.4-1985
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Magnesite-chrome refractories--Determination of aluminium oxide--EDTA volumetric method
WITHDRAWN published on 17.4.1985
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GB/T 5070.4-2002
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Chemical analysis of magnesia chromite refractories—Part 4:Determination of aluminium oxide—EDTA volumetric method
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GB/T 5070.5-1985
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Magnesite-chrome refractories--Determination of titanium dioxide content--Diantipyrylmethane photometric method
WITHDRAWN published on 17.4.1985
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GB/T 5070.5-2002
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Chemical analysis of magnesia chromite refractories—Part 5:Determination of titanium dioxide—Diantipylmethane photometric method
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GB/T 5070.6-1985
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Magnesite-chrome refractories--Determination of calcium oxide content--EGTA volumetric method
WITHDRAWN published on 17.4.1985
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GB/T 5070.6-2002
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Chemical analysis of magnesia chromite refractories—Part 6:Determination of calcium oxide—EGTA volumetric method
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GB/T 5070.7-1985
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Magnesite-chrome refractories--Determination of magnesium oxide content--CyDTA volumetric method
WITHDRAWN published on 17.4.1985
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GB/T 5070.7-2002
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Chemical analysis of magnesia chromite refractories—Part 7:Determination of calcium oxide—EDTA volumetric method
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GB/T 5070.8-1985
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Magnesite-chrome refractories--Determination of chromium oxide content--Ammonium ferrous sulfate volumetric method
WITHDRAWN published on 17.4.1985
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