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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
Non-destructive testing—Metallographic replica techniques of surface examination
WITHDRAWN published on 12.8.1998
Selected format:Ductile iron pipes—External zinc-spray coating
WITHDRAWN published on 12.8.1998
Selected format:Ductile iron pipes - External zinc-based coating - Part 1: Metallic zinc with finishing layer
WITHDRAWN published on 30.10.2009
Selected format:Ductile iron pipes - External zinc coating - Part 2: Zinc rich paint with finishing layer
WITHDRAWN published on 10.1.2011
Selected format:Ductile iron pipes—Centrifugal cement mortar lining—General requirements
WITHDRAWN published on 12.8.1998
Selected format:Ductile iron pipes and fittings—Cement mortar lining
WITHDRAWN published on 30.10.2009
Selected format:Ductile iron pipes—Centrifugal cement mortar lining—Composition controls of freshly applied mortar
WITHDRAWN published on 12.8.1998
Selected format:Ductile iron pipes—Bitumen coating
WITHDRAWN published on 12.8.1998
Selected format:Method of test for water content in paints by distillation
WITHDRAWN published on 15.9.1979
Selected format:Chemical conversion coatings—Rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys
WITHDRAWN published on 12.8.1998
Selected format:Latest update: 2026-08-11 (Number of items: 2 292 404)
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