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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
Determination of T501 oxidation inhibitor content in transformer oil or turbine oil - Part 1: Spectrophotometric method
Standard published on 24.9.2008
Selected format:Determination of T501 oxidation inhibitor content in transformer oil or turbine oil - Part 2: Liquid chromatography
Standard published on 30.12.2008
Selected format:Determination of T501 oxidation inhibitor content in transformer oil or turbine oil - Part 3: Infrared spectroscopy method
Standard published on 30.12.2008
Selected format:Quantitative determination of T501 oxidation inhibitor content in transformer oil or turbine oil—Part 4: GC/MS method
Standard published on 1.11.2017
Selected format:Determination of the aromatic carbon content in mineral insulating oil
Standard published on 29.6.2012
Selected format:Determination of demulsibility for turbine oils in service
Standard published on 23.8.2024
Selected format:Criteria for changing of diesel engine oil
Standard published on 10.1.2011
Selected format:General test method for transmission performance of PCM voice channel in telecommunication network
Standard published on 14.12.1995
Selected format:Characteristic of the electrical interface at hierarchical bit rate for digital network
Standard published on 25.4.2016
Selected format:Electrical characteristics for unbalanced double-current interchange circuits for general use with inte-grated circuit equipment in the field of data communications
Standard published on 3.4.1987
Selected format:Latest update: 2026-05-14 (Number of items: 2 277 490)
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