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Standards GB - Chinese national standards - Page 5125
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 6730.23-2025
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Iron ores—Determination of titanium content—The ferric ammonium sulfate titrimetric method
Standard published on 30.6.2025
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GB/T 6730.24-2025
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Iron ores—Determination of total rare earth contents—Arsenazo III spectrophotometric method
Standard published on 25.4.2025
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GB/T 6730.25-2021
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Iron ores—Determination of total rare earth contents—Oxalate gravimetric method
Standard published on 31.12.2021
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GB/T 6730.26-2017
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Iron ores—Determination of fluorine content—Thorium nitrate titrimetric method
Standard published on 7.9.2017
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GB/T 6730.27-2017
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Iron ores—Determination of fluorine content—Lanthanum-alizarin complexion spectrophotometric method
Standard published on 31.7.2017
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GB/T 6730.28-2021
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Iron ores—Determination of fluorine content—Ion-selective electrode method
Standard published on 31.12.2021
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GB/T 6730.29-2016
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Iron ores—Determination of barium content—Barium sulfate grarimetric method
Standard published on 13.12.2016
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GB/T 6730.3-2017
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Iron ores—Determination of hygroscopic moisture in analytical samples—Gravimetric, Karl Fischer and mass-loss methods
Standard published on 14.10.2017
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GB/T 6730.30-2017
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Iron ores—Determination of chromium content—Diphenyl carbazide spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.30-2017E
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Iron ores—Determination of chromium content—Diphenyl carbazide spectrophotometric method
Standard published on 7.9.2017
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