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GB - Chinese national standards - Page 8641

Standards GB - Chinese national standards - Page 8641

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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Publication year
Preview GB/T 7731.13-1988 21.2.1988
GB/T 7731.13-1988 WITHDRAWN

Methods for chemical analysis of ferrotungsten—The combustion-neutralization titration method for the determination of sulfur content

WITHDRAWN published on 21.2.1988

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Preview GB/T 7731.14-1988 30.12.1988
GB/T 7731.14-1988 WITHDRAWN

Methods for chemical analysis of ferrotungsten—The polarographic method for the determination of lead content

WITHDRAWN published on 30.12.1988

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Preview GB/T 7731.15-1999 1.11.1999
GB/T 7731.15-1999 WITHDRAWN

Methods for chemical analysis of ferrotungsten-The flame atomic absorption spectrometric method for the determination of copper content

WITHDRAWN published on 1.11.1999

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in 3 working days
Preview GB/T 7731.16-1999 1.11.1999
GB/T 7731.16-1999 WITHDRAWN

Methods for chemical analysis of ferrotungsten The flame atomic absorption spectrometric method for the determination of manganese content

WITHDRAWN published on 1.11.1999

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Preview GB/T 7731.2-1987 12.5.1987
GB/T 7731.2-1987 WITHDRAWN

Methods for chemical analysisof ferrotungsten--The sodium periodate photometric method for the determinationof manganese content

WITHDRAWN published on 12.5.1987

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Preview GB/T 7731.3-1987 12.5.1987
GB/T 7731.3-1987 WITHDRAWN

Methods for chemical analysis of ferrotungsten--The bis (cyclohexanone) oxalyldihydrazone photometric method for the determination of copper content

WITHDRAWN published on 12.5.1987

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Preview GB/T 7731.4-1987 12.5.1987
GB/T 7731.4-1987 WITHDRAWN

Methods for chemical analysis of ferrotungsten--The molybdenum blue photometric method for the determination of phosphorus content

WITHDRAWN published on 12.5.1987

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Preview GB/T 7731.5-1987 12.5.1987
GB/T 7731.5-1987 WITHDRAWN

Methods for chemical analysis of ferrotungsten--The molybdenum blue photometric method for the determination of silicon content

WITHDRAWN published on 12.5.1987

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Preview GB/T 7731.6-1987 31.3.1987
GB/T 7731.6-1987 WITHDRAWN

Methods for chemical analysis of ferrotungsten—The molybdenum blue photometric method for the determination of arsenic content

WITHDRAWN published on 31.3.1987

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Preview GB/T 7731.7-1987 12.5.1987
GB/T 7731.7-1987 WITHDRAWN

Methods for chemical analysis of ferrotungsten--The phenylfluorone photometric method for the determinationof tin content

WITHDRAWN published on 12.5.1987

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