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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
Inductor and transformer cores for telecommunications--Part 4: Blank detail specification: Magnetic oxide cores for transformers and chokes for power applications--Assessment level A
WITHDRAWN published on 30.6.1988
Selected format:Dimensions of pot-cores made of magnetic oxides and associated parts
WITHDRAWN published on 30.6.1988
Selected format:Detail specification for electronic components UYF10 magnetic oxide cores--Assessment level A
WITHDRAWN published on 1.1.1988
Selected format:Measuring methods of cores for inductors and transformers for telecommunications
WITHDRAWN published on 30.6.1988
Selected format:Measuring methods of cores for inductors and transformers for telecommunications
WITHDRAWN published on 18.7.2002
Selected format:Measuring methods for properties ofgyromagnetic materials intended for application at microwave frequencies
WITHDRAWN published on 30.6.1988
Selected format:Guide to the specification of limits for physical imperfections of parts made from magnetic oxides
WITHDRAWN published on 30.6.1988
Selected format:Ferrite cores—Guide on the limits of surface irregularities—Part 2:RM-cores
WITHDRAWN published on 4.12.2002
Selected format:Electrotechnical terminology Magnetic materials and components
WITHDRAWN published on 1.1.1988
Selected format:Gravimetric determination of smoke particulates from combustion of plastic materials
WITHDRAWN published on 8.7.1988
Selected format:Latest update: 2025-10-15 (Number of items: 2 238 420)
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