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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
The transmission performance objectives for mixed analogue-digital public telephone automatic switching network
WITHDRAWN published on 4.2.1993
Selected format:Local telecommunication cables with paper insulation and lead sheath
WITHDRAWN published on 4.2.1993
Selected format:High frequency symmetrical telecommunication cables with copper conductor star quads and lead sheath
WITHDRAWN published on 4.2.1993
Selected format:Fiber optic filters--Part 1:Generic specification
WITHDRAWN published on 4.2.1993
Selected format:Optical fiber mechanical—type splice insertion loss test
WITHDRAWN published on 4.2.1993
Selected format:Requirements for aerial optical fiber cable systems joined to national public telecommunication network
WITHDRAWN published on 4.2.1993
Selected format:Silicon epitaxial wafers
WITHDRAWN published on 6.2.1993
Selected format:Silicon epitaxial wafers
WITHDRAWN published on 30.10.2009
Selected format:General purpose screw threads for joints on pipe line--Dimensions
WITHDRAWN published on 15.8.1978
Selected format:General purpose metric screw threads—The plan for pipe systems
WITHDRAWN published on 22.5.2003
Selected format:Latest update: 2025-07-01 (Number of items: 2 206 436)
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