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Standards GB - Chinese national standards - Page 5390
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 7991.4-2019
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Test method of viterous and porcelain enamels—Part 4Determination of resistance to impact
Standard published on 10.12.2019
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GB/T 7991.5-2014
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Test method of viterous and porcelain enamels—Part 5Determination of thickness by electromagnetic mothod
Standard published on 5.12.2014
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GB/T 7991.6-2025
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Test method of viterous and porcelain enamels—Part 6High voltage test
Standard published on 29.8.2025
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GB/T 7991.7-2019
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Test method of viterous and porcelain enamels—Part 7Determination of coefficient of mean lincar thermal expansion
Standard published on 10.12.2019
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GB/T 7991.9-2014
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Test method of vitreous and porcelain enamelsPart 9: Determination of adhesion tensile strength
Standard published on 5.12.2014
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GB/T 7994.1-2014
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Test method of glass-lined equipments—Part 1: Hydraulic pressure test
Standard published on 5.12.2014
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GB/T 7994.2-2014
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Test method of glass-lined equipmentsPart 2: Gas leak test
Standard published on 5.12.2014
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GB/T 7994.3-2022
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Test method of glass-lined equipments—Part 3Resistance to mechanical impact via the pistol test
Standard published on 30.12.2022
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GB/T 7996-2020
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Norminal capacity and diameter of glass-lined equipment
Standard published on 19.11.2020
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GB/T 7997-2014
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Hardmetals—Vickers hardness test
Standard published on 24.7.2014
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