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Standards GB - Chinese national standards - Page 271
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 13254-2017
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Caprolactam for industrial use
Standard published on 1.11.2017
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GB/T 13255.1-2009
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Test methods of caprolactam for industrial use - Part 1: Determination of colourity of 50% aqueous caprolactam solution - Spectrometric method
Standard published on 13.5.2009
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GB/T 13255.2-2009
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Test methods of caprolactam for industrial use - Part 2: Determination of crystallizing point
Standard published on 13.5.2009
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GB/T 13255.3-2009
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Test methods of caprolactam for industrial use - Part 3: Determination of permanganate absorption number - Spectrometric method
Standard published on 13.5.2009
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GB/T 13255.4-2009
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Test methods of caprolactam for industrial use - Part 4: Determination of volatile bases content - Titrimetric method after distillation
Standard published on 13.5.2009
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GB/T 13255.5-2009
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Test methods of caprolactam for industrial use - Part 5: Determination of absorbance at a wavelength of 290nm
Standard published on 13.5.2009
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GB/T 13255.6-2009
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Test methods of caprolactam for industrial use - Part 6: Determination of acidity or alkalinity
Standard published on 13.5.2009
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GB/T 13255.7-2009
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Test methods of caprolactam for industrial use - Part 7: Determination of iron content
Standard published on 13.5.2009
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GB/T 13255.8-2009
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Test methods of caprolactam for industrial use - Part 8: Determination of cyclohexanone oxime content
Standard published on 13.5.2009
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GB/T 13258-2016
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Phosphorus pentasulfide for industrial use
Standard published on 13.12.2016
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