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Standards GB - Chinese national standards - Page 7688
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 8638.8-1988
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Nickel base alloy powder—Determination of copper content—Neocuproine-chloroform extraction spectrophotometric method
WITHDRAWN published on 11.1.1988
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GB/T 8638.9-1988
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Nickel base alloy powder—Determination of copper content—Thiosulfate-iodimetric method
WITHDRAWN published on 11.1.1988
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GB/T 8639.1-1988
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Vanadium—Determination of vanadium content—Potassium permanganate-ammonium ferrous sulphate volumetric method
WITHDRAWN published on 8.2.1988
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GB/T 8639.2-1988
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Vanadium—Determination of chromium content—Diphenylcarbazide spectrophotometric method
WITHDRAWN published on 8.2.1988
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GB/T 8639.3-1988
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Vanadium—Determination of aluminium content—CAS-TPC spectrophotometric method
WITHDRAWN published on 8.2.1988
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GB/T 8639.4-1988
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Vanadium—Determination of iron content—Phenanthrline spectrophotometric method
WITHDRAWN published on 8.2.1988
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GB/T 8639.5-1988
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Vanadium—Determination of iron content—Isoamyl alcohol extraction spectrophotometric method
WITHDRAWN published on 8.2.1988
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GB/T 8639.6-1988
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Vanadium—Determination of silicon content—N-butyl alcohol extraction spectrophotometric method
WITHDRAWN published on 8.2.1988
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GB/T 8639.7-1988
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Vanadium—Determination of oxygen content—Impulse fusion-gas chromatographic method
WITHDRAWN published on 8.2.1988
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GB/T 8640-1988
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Thermal sprayed metallic coatings—Rockwell hardness test
WITHDRAWN published on 8.2.1988
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