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Standards GB - Chinese national standards - Page 4253
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 4324.14-2012
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Methods for chemical analysis of tungsten - Part 14: Determination of residue content after chloride volatility - Gravimetric method
Standard published on 31.12.2012
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GB/T 4324.15-2008
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Methods for chemical analysis of tungsten - Determination of magnesium content - The flame atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry
Standard published on 9.6.2008
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GB/T 4324.16-2012
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Methods for chemical analysis of tungsten - Part 16: Determination of loss content on ignition - Gravimetric method
Standard published on 31.12.2012
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GB/T 4324.17-2012
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Methods for chemical analysis of tungsten - Part 17: Determination of sodium content - Flame atomic absorption spectrometry
Standard published on 31.12.2012
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GB/T 4324.18-2012
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Methods for chemical analysis of tungsten - Part 18: Determination of potassium content - Flame atomic absorption spectrometry
Standard published on 31.12.2012
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GB/T 4324.19-2012
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Methods for chemical analysis of tungsten - Part 19: Determination of titanium content - The diantipyrylmethane photometric spectrophtometry
Standard published on 31.12.2012
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GB/T 4324.2-2023
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Methods for chemical analysis of tungsten—Part 2:Determination of bismuth and arsenic contents
Standard published on 27.11.2023
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GB/T 4324.20-2012
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Methods for chemical analysis of tungsten - Part 20: Determination of vanadium content - Inductively coupled plasma atomic emission spectrometry
Standard published on 31.12.2012
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GB/T 4324.21-2012
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Methods for chemical analysis of tungsten - Part 21: Determination of chromium content - Inductively coupled plasma atomic emission spectrometry
Standard published on 31.12.2012
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GB/T 4324.22-2012
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Methods for chemical analysis of tungsten - Part 22: Determination of manganese content - Inductively coupled plasma atomic emission spectrometry
Standard published on 31.12.2012
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