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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
Guide for the determination of thermal endurance properties of electrical insulating materials--Part 1:General guidelines for ageing procedures and evaluation of test results
WITHDRAWN published on 31.3.1989
Selected format:Electrical insulating materials-Properties of thermal endurance—Part 1:Ageing procedures and evaluation of test results
WITHDRAWN published on 9.10.2003
Selected format:Guide for the determination of thermal endurance properties of electrical insulating materials Part 2:Choice of test criteria
WITHDRAWN published on 17.10.2000
Selected format:Electrical insulating materials—Thermal endurance properties—Part 3:Instructions for calculating thermal endurance characteristics
WITHDRAWN published on 9.11.2006
Selected format:Guide for the determination of thermal endurance properties of electrical insulating materials—Part 4:Ageing ovens—Single-chamber ovens
WITHDRAWN published on 13.9.1999
Selected format:-
WITHDRAWN published on 1.1.1989
Selected format:Specification for insulating varnishes containing solvent-Specifications for individual materials-Requirements for hot curing impregnating varnishes
WITHDRAWN published on 23.3.1999
Selected format:Cross-arm insulators of ceramic material for high voltage overhead lines--Technical specifications
WITHDRAWN published on 1.1.1989
Selected format:Cross-arm insulators of ceramic material for high voltage overhead lines--Dimensions and characteristics
WITHDRAWN published on 1.1.1989
Selected format:Cotton—Upland cotton
WITHDRAWN published on 2.7.1999
Selected format:Latest update: 2026-04-02 (Number of items: 2 270 295)
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