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Standards GB - Chinese national standards - Page 5241
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 8309-2013
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Tea—Determination of alkalinity of water-soluble ash content
Standard published on 31.12.2013
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GB/T 831-1988
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Slotted shoulder screws
Standard published on 24.6.1988
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GB/T 8310-2013
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Tea—Determination of crude fibre content
Standard published on 31.12.2013
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GB/T 8311-2013
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TeaDetermination of dust and broken content
Standard published on 31.12.2013
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GB/T 8312-2013
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Tea—Determination of caffeine content
Standard published on 31.12.2013
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GB/T 8313-2018
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Determination of total polyphenols and catechins content in tea
Standard published on 13.7.2018
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GB/T 8314-2013
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Tea—Determination of free amino acids content
Standard published on 31.12.2013
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GB/T 832-1988
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Slotted cap stan screws
Standard published on 24.6.1988
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GB/T 8320-2017
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Copper-tungsten and silver-tungsten electrical contacts
Standard published on 1.11.2017
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GB/T 8320-2025
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Copper-tungsten and silver-tungsten electrical contacts
Execute Date: may 2026
Standard published on 31.10.2025
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