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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
Methods for chemical analysis of zirconium and zirconium alloys—Part 5Determination of aluminium content—Chronic azurol-S-tetradrcylpyridine chloride spectrophotometry
Standard published on 4.6.2019
Selected format:Methods for chemical analysis of zirconium and zirconium alloys—Part 6Determination of copper content—2,9-Dimethyl-1,10-phenanthroline spectrophotometry
Standard published on 4.6.2019
Selected format:Methods for chemical analysis of zirconium and zirconium alloys—Part 7Determination of manganese content—Patassium periodate spectrometry and inductively coupled plasma atomic emission spectrometry
Standard published on 31.12.2019
Selected format:Methods for chemical analysis of zirconium and zirconium alloys—Part 8Determination of cobalt content—Nitroso-R-salt spectrophotometry
Standard published on 29.9.2017
Selected format:Methods for chemical analysis of zirconium and zirconium alloys—Part 9Determination of magnesium content—Flame atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry
Standard published on 12.10.2022
Selected format:Chemical analysis methods of magnesium and magnesium alloys - Part 1Determination of aluminium content
Standard published on 6.9.2013
Selected format:Chemical analysis methods of magnesium and magnesium alloys - Part 10Determination of silicon content - Molybdenum blue spectrophotometric method
Standard published on 6.9.2013
Selected format:Chemical analysis methods of magnesium and magnesium alloys Determination of beryllium content Solochrome cyanine R spectrophotometric method
Standard published on 26.7.2005
Selected format:Chemical analysis methods of magnesium and magnesium alloys - Part 12Determination of copper content
Standard published on 27.11.2013
Selected format:Chemical analysis methods of magnesium and magnesium alloys Determination of lead content Flame atomic absorption spectrophotometric method
Standard published on 26.7.2005
Selected format:Latest update: 2026-06-11 (Number of items: 2 281 927)
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