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Standards GB - Chinese national standards - Page 7751
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 3780.18-1998
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Carbon black in natural rubber—Recipe and evaluation method
WITHDRAWN published on 4.11.1998
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GB/T 3780.18-2007
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Carbon black—Part 18:Standard test methods for evaluation in natural rubber(NR)
WITHDRAWN published on 13.12.2007
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GB 3780.2-1983
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Carbon black--Determination of dibutyl phthalate absorption number (Method A)
WITHDRAWN published on 1.1.1983
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GB/T 3780.2-1994
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Carbon black—Determination of dibutylphthalate absorption number
WITHDRAWN published on 22.12.1994
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GB/T 3780.2-2003
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Carbon black—Part2:Determination of dibutyl phthalate absorption number
WITHDRAWN published on 11.10.2003
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GB/T 3780.2-2007
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Carbon black—Part 2:Determination of oil absorption number
WITHDRAWN published on 13.12.2007
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GB 3780.20-1988
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WITHDRAWN published on 1.1.1988
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GB/T 3780.20-1997
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Carbon black for use in the rubber industry—Determination of light transmittance of toluene extract—Method for product evaluation
WITHDRAWN published on 26.9.1997
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GB/T 3780.21-1991
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Carbon black used in rubber products--Determination of sieve residue--Water washing method
WITHDRAWN published on 23.4.1991
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GB/T 3780.21-2002
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Carbon black used in rubber products—Determination of sieve residue—Water washing method
WITHDRAWN published on 29.5.2002
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