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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
Electrical strength of insulating materials—Test methods—Part 1:Tests at power frequencies
WITHDRAWN published on 9.11.2006
Selected format:Electrical strength of insulating materials—Test methods—Part 2:Additional requirements for tests using direct voltage
WITHDRAWN published on 9.11.2006
Selected format:Electric strength of insulating materials—Test methods—Part 3:Additional requirements for 1.2/50 s impulse tests
WITHDRAWN published on 3.12.2007
Selected format:Generic specification of mini-magnetic head for Winchester disk drive
WITHDRAWN published on 7.1.1993
Selected format:General specification for English character keyboard for information processing
WITHDRAWN published on 7.1.1993
Selected format:Generic specification of 9-track digital magnetic head for digital magnetic tape unit
WITHDRAWN published on 7.1.1993
Selected format:Generic specification for the Chinese ideograph keyboard
WITHDRAWN published on 7.1.1993
Selected format:Pre-recorded optical reflective videodisk system "Laser vision" 50 Hz/625 lines—PAL
WITHDRAWN published on 7.1.1993
Selected format:Safety valves for marine air vessel
WITHDRAWN published on 9.1.1993
Selected format:Marine halon fire extinguishing system technical specifications
WITHDRAWN published on 9.1.1993
Selected format:Latest update: 2025-07-03 (Number of items: 2 207 355)
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