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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
Preparation of outline drawings of cathode-ray tubes
WITHDRAWN published on 21.3.1989
Selected format:Measuring methods of the heater or filament current and voltage for electronic tubes
WITHDRAWN published on 1.1.1989
Selected format:Measuring methods of electrical properties of frequency agility pulsed magnetron
WITHDRAWN published on 21.3.1989
Selected format:Detail specification for electronic components--Electronic tube of type FU-250F
WITHDRAWN published on 1.1.1989
Selected format:Detail specification for electronic components--Electronic tube of type FU-100F
WITHDRAWN published on 1.1.1989
Selected format:Internal combustion engines—Piston rings—General specifications
WITHDRAWN published on 20.12.1994
Selected format:Internal combustion engines—Piston rings—Part 11:Half keystone rings made of cast iron
WITHDRAWN published on 10.11.2010
Selected format:Internal combustion engines—Piston rings—Part 12:Half keystone rings made of steel
WITHDRAWN published on 31.12.2013
Selected format:Internal combustion engines—Piston rings—Vocabulary
WITHDRAWN published on 20.12.1994
Selected format:Internal combustion engines—Piston rings-Scraper rings
WITHDRAWN published on 14.11.1992
Selected format:Latest update: 2026-01-23 (Number of items: 2 257 393)
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