Standards GB - Chinese national standards - Page 331

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 13748.9-2013

Chemical analysis methods of magnesium and magnesium alloys - Part 9Determination of iron content - Orthopenanthroline spectrophotometric method

Standard published on 6.9.2013

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GB/T 13748.9-2026

Methods for chemical analysis of magnesium and magnesium alloys—Part 9: Determination of iron and silicon content—Spectrophotometric method
Execute Date: december 2026

Standard published on 25.5.2026

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GB/T 13749-2022

Impact pile driver—Code of practice of safety operation

Standard published on 12.10.2022

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