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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
High pure graphite materials--Determination of chlorines content--Spectrophotometric method
WITHDRAWN published on 1.1.1988
Selected format:High pure graphite materials--Determination of total rare earths content--Spectrophotometric method
WITHDRAWN published on 1.1.1988
Selected format:Dimensions of the carbon block for blast furnaces
WITHDRAWN published on 1.1.1988
Selected format:Method for determination of content of quinoline-insoluble of modified pitch
WITHDRAWN published on 1.1.1988
Selected format:Method for determination of coking value of coal pitch
WITHDRAWN published on 22.2.1988
Selected format:-
WITHDRAWN published on 1.1.1988
Selected format:Foundry coke
WITHDRAWN published on 22.2.1988
Selected format:Modified pitch
WITHDRAWN published on 1.1.1988
Selected format:Free-cutting steel—Technical requirements
WITHDRAWN published on 22.2.1988
Selected format:Free-cutting structural steel
WITHDRAWN published on 11.9.2008
Selected format:Latest update: 2026-06-12 (Number of items: 2 281 969)
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