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Standards GB - Chinese national standards - Page 7840
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 4689.16-1984
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Leather--Determination of water--soluble matter, water-soluble inorganic matter and water-soluble organic matter
WITHDRAWN published on 1.1.1984
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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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GB 4689.19-1984
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Leather--Determination of pH
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GB 4689.2-1984
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Leather--Conditioning of test pieces for physical tests
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GB/T 4689.20-1996
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Leather—Determination of adhesion of finish
WITHDRAWN published on 17.12.1996
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GB/T 4689.21-1996
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Leather—Determination of absorption of water
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GB/T 4689.22-1996
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Leather—Determination of air permeability
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GB 4689.3-1984
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Leather--Sampling--Number of items for a gross sample
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GB 4689.4-1984
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Leather--Physical testing--Measurement of thickness
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