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Standards GB - Chinese national standards - Page 7972
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 4689.1-1984
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Leather--Laboratory sample--Location and identification
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GB 4689.10-1984
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Leather--Determination of apparent density
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GB 4689.11-1984
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Leather--Preparation of chemical test samples
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GB 4689.12-1984
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Leather--Determination of water and other volatile matter
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GB 4689.13-1984
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Leather--Determination of matter soluble in dichloromethane
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GB 4689.14-1984
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Leather--Determination of sulphated total ash and sulphated water insoluble ash
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GB 4689.15-1984
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Leather--Determination of chrome oxide
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GB 4689.16-1984
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Leather--Determination of water--soluble matter, water-soluble inorganic matter and water-soluble organic matter
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GB 4689.17-1984
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Leather--Determination of nitrogen content and hide substance--Titrimetric method
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GB 4689.18-1984
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Leather--Calculation of degree of tannage, leather substance and bond organic substance
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