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Standards GB - Chinese national standards - Page 4371

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

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GB/T 44069.13-2025

Ferrite cores—Guidelines on dimensions and the limits of surface irregularities—Part 13: PQ-cores

Standard published on 31.12.2025

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GB/T 44069.14-2025

Ferrite cores—Guidelines on dimensions and the limits of surface irregularities—Part 14: EFD-cores

Standard published on 31.12.2025

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GB/T 44069.4-2024

Ferrite cores—Guidelines on dimensions and the limits of surface irregularities—Part 4: RM-cores

Standard published on 28.5.2024

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GB/T 44069.5-2025

Ferrite cores—Guidelines on dimensions and the limits of surface irregularities—Part 5: EP-cores and associated parts for use in inductors and transformers

Standard published on 31.12.2025

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GB/T 44069.6-2026

Ferrite cores—Guidelines on dimensions and the limits of surface irregularities—Part 6: ETD-cores for use in power supplies
Execute Date: november 2026

Standard published on 2.7.2026

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ON REQUEST

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GB 4407.1-2008

Seed of economic crops - Part 1Fibre species

Standard published on 14.4.2008

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