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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
Industrial circulating cooling water—Determination of calcium,magnesium—Atomic absorption spectrometric method
WITHDRAWN published on 13.8.2007
Selected format:Industrial circulating cooling water and scale—Determination of copper,zinc—Atomic absorption spectrometric method
WITHDRAWN published on 13.8.2007
Selected format:Industrial circulating cooling water—Determination of zinc—Atomic absorption spectrometric method
WITHDRAWN published on 6.8.1993
Selected format:Scale in industrial circulating cooling water—Determination of zinc—Atomic absorption spectrometric method
WITHDRAWN published on 6.8.1993
Selected format:Industrial circulating cooling water—Determination of copper—Atomic absorption spectrometric method
WITHDRAWN published on 6.8.1993
Selected format:Scale in industrial circulating cooling water—Determination of copper—Atomic absorption spectrometric method
WITHDRAWN published on 6.8.1993
Selected format:Industrial circulating cooling water—Determination of magnesium—Atomic absorption spectrometric method
WITHDRAWN published on 6.8.1993
Selected format:Test method for density of nonmetal sandwich constructions or cores
WITHDRAWN published on 4.11.1978
Selected format:Test method for density of sandwich construction or cores
WITHDRAWN published on 18.5.2005
Selected format:Industrial circulating cooling water—Determination of potassium—Atomic absorption spectrometric method
WITHDRAWN published on 6.8.1993
Selected format:Latest update: 2026-04-06 (Number of items: 2 271 069)
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