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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
Chemical analysis of nitrate of rare earth for agriculture—Determination for the water insoluble matter content—Gravimetric method
WITHDRAWN published on 30.12.1990
Selected format:Styrene for industrial use—Determination of purity—Capillary gas chromatography
WITHDRAWN published on 13.7.1998
Selected format:Test method of styrene for industrial use—Part 1:Determination of purity and hydrocarbon impurities—Gas chromatography
WITHDRAWN published on 12.5.2011
Selected format:Styrene for industrial use--Determination of purity--Crystallizing point method
WITHDRAWN published on 30.12.1990
Selected format:Styrene for industrial use—Determination of content of polymer—Photometric method
WITHDRAWN published on 30.12.1990
Selected format:Styrene for industrial use—Determination of content of peroxides—Titrimetric method
WITHDRAWN published on 30.12.1990
Selected format:Styrene for industrial use—Determination of content of total aldehydes—Titrimetric method
WITHDRAWN published on 30.12.1990
Selected format:Test method of styrene for industrial use—Part 5:Determination of content of total aldehydes—Titrimetric method
WITHDRAWN published on 12.5.2011
Selected format:Styrene for industrial use—Determination of trace sulfur—Oxidative micro-coulometric method
WITHDRAWN published on 30.12.1990
Selected format:Styrene for industrial use--Determination of content of inhibitor (P-tert-butylcatechol)--Colorimetric method
WITHDRAWN published on 1.1.1990
Selected format:Latest update: 2026-04-06 (Number of items: 2 271 069)
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