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Standards GB - Chinese national standards - Page 4254
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 4324.23-2012
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Methods for chemical analysis of tungsten - Part 23: Determination of sulfur content - The combustion-conductometric titration and high frequency combustion-infrared absorption method
Standard published on 31.12.2012
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GB/T 4324.24-2012
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Methods for chemical analysis of tungsten - Part 24: Determination of phosphorus content - Molybdemum blue photometry
Standard published on 31.12.2012
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GB/T 4324.25-2012
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Methods for chemical analysis of tungsten - Part 25: Determination of oxygen content - Pulse heating inert gas fusion-infrared absorption method
Standard published on 31.12.2012
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GB/T 4324.26-2012
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Methods for chemical analysis of tungsten - Part 26: Determination of nitrogen content - Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry
Standard published on 31.12.2012
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GB/T 4324.27-2012
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Methods for chemical analysis of tungsten - Part 27:Determination of carbon content - High frequency combustion-infrared absorption method
Standard published on 31.12.2012
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GB/T 4324.28-2012
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Methods for chemical analysis of tungsten - Part 28: Determination of molybdenum content - The thioyanate spectrophotometry
Standard published on 31.12.2012
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GB/T 4324.3-2012
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Methods for chemical analysis of tungsten - Part 3: Determination of tin content - Hydrogenate atomic absorption spectrometry
Standard published on 31.12.2012
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GB/T 4324.4-2012
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Methods for chemical analysis of tungsten - Part 4: Determination of antimony content - Hydrogenate atomic absorption spectrometry
Standard published on 31.12.2012
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GB/T 4324.6-2012
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Methods for chemical analysis of tungsten - Part 6: Determination of iron content-1,10-phenanthroline spectrophotometry
Standard published on 31.12.2012
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GB/T 4324.7-2012
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Methods for chemical analysis of tungsten - Part 7: Determination of cobalt content - Inductively coupled plasma atomic emission spectrometry
Standard published on 31.12.2012
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