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Standards GB - Chinese national standards - Page 7464
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 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WITHDRAWN published on 8.2.1988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
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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WITHDRAWN published on 8.2.1988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
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GB/T 8639.6-1988
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Vanadium—Determination of silicon content—N-butyl alcohol extraction spectrophotometric method
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GB/T 8639.7-1988
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Vanadium—Determination of oxygen content—Impulse fusion-gas chromatographic method
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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WITHDRAWN published on 8.2.1988
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GB/T 8641-1988
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Thermal sprayed coatings—Determination of tensile strength
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GB/T 8642-1988
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Thermal sprayed coatings--Determination of adhesion strength
WITHDRAWN published on 8.2.1988
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GB/T 8643-1988
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Lubricated metallic powders--Determination of lubricant content--Soxhlet extraction method
WITHDRAWN published on 8.2.1988
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