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Standards GB - Chinese national standards - Page 452
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 14849.2-2007
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Methods for chemical analysis of silicon metal - Part 2Determination of aluminum content - Chrome azurol S spectrophotometric method
Standard published on 25.10.2007
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GB/T 14849.3-2020
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Methods for chemical analysis of silicon metal—Part 3Determination of calcium content
Standard published on 6.3.2020
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GB/T 14849.4-2014
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Methods for chemical analysis of silicon metalPart 4Determination of impurity contentsInductively coupled plasma atomic emission spectrometric method
Standard published on 5.12.2014
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GB/T 14849.5-2014
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Methods for chemical analysis of silicon metalPart 5Determination of impurity contentsX-ray fluorescence method
Standard published on 5.12.2014
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GB/T 14849.6-2014
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Methods for chemical analysis of silicon metalPart 6Determination of carbonInfrared absorption method
Standard published on 5.12.2014
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GB/T 14849.7-2015
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Methods for chemical analysis of silicon metal—Part 7: Determination of phosphorus content—Phosphorus molybdenum blue spectrophotometry
Standard published on 11.9.2015
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GB/T 14849.8-2015
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Methods for chemical analysis of silicon metal—Part 8: Determination of copper content—Atomic absorption spectrometric method
Standard published on 11.9.2015
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GB/T 14849.9-2015
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Methods for chemical analysis of silicon metal—Part 9: Determination of titanium content —Diantipyryl methane spectrophotometry
Standard published on 11.9.2015
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GB/T 14850-2020
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Gas analysis—Vocabulary
Standard published on 31.3.2020
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GB/T 14851-2025
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Electronic specialty gas—Phosphine
Standard published on 28.3.2025
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