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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
Road vehicles--90 semi-trailer fifth wheel coupling pin--Basic and mounting/interchangeability dimensions
WITHDRAWN published on 31.7.1984
Selected format:Test for melting point of semicrystalline polymers Optical method
WITHDRAWN published on 30.7.1984
Selected format:Test for flammability of plastics--Vertical burning method
WITHDRAWN published on 1.1.1984
Selected format:Paper and board determination of capillary rise--Klemm methods
WITHDRAWN published on 31.3.1989
Selected format:Paper and board determination of the rate of surface absorbing
WITHDRAWN published on 31.3.1989
Selected format:Paper and board—Determination of the rate of surface absorbing
WITHDRAWN published on 6.9.2002
Selected format:Paper and board--Determination of absorption after immersion in water
WITHDRAWN published on 31.3.1989
Selected format:Test for flammability of plastics—Ignition temperature test
WITHDRAWN published on 30.7.1984
Selected format:Determination method of "fish eyes" for polyvinyl chloride resins of general use
WITHDRAWN published on 6.1.1993
Selected format:Epoxide compounds—Determination of epoxide equivalent
WITHDRAWN published on 30.7.1984
Selected format:Latest update: 2025-12-22 (Number of items: 2 253 013)
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