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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
Performance and test methods of the fourth order digital multiplex equimpent operatingat 139264 kbit/s and using positive justification
Standard published on 6.4.1995
Selected format:Low-frequency telecommunication cables and wires with PVC insulation and PVC sheath--Part 1:General test and measuring methods
Standard published on 2.8.1999
Selected format:Geometrical Product Specifications(GPS)Cone tolerance
Standard published on 16.5.2005
Selected format:Measurement of departures from straightness
Standard published on 11.11.2004
Selected format:Measurement of departures from flatness
Standard published on 11.11.2004
Selected format:Analytical methods of potassium-40 in water
Standard published on 22.4.1989
Selected format:Machine reamers with edge inclination
Standard published on 4.11.2008
Selected format:Limits and measurement methods for crankcase pollutants From heavy-duty vehicles equipped with P.I engines
Standard published on 15.4.2005
Selected format:Safety rules for overhead chain conveyers
Standard published on 11.12.2008
Selected format:Non-destructive testing - Practice for ultrasonic angle-beam testing by the contact method
Standard published on 13.5.2008
Selected format:Latest update: 2026-04-24 (Number of items: 2 274 650)
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