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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 lead concentratesDetermination of lead contentBack titration of EDTA after precipitation of lead sulfate
Standard published on 24.8.2006
Selected format:Methods for chemical analysis of lead concentratesDetermination of aluminium(III)oxide contentChromazurol S spectrophotometric method
Standard published on 24.8.2006
Selected format:Methods for chemical analysis of lead concentratesDetermination of zinc contentEDTA titration method
Standard published on 24.8.2006
Selected format:Methods for chemical analysis of lead concentratesDetermination of arsenic contentAtomic fluorescence spectrometer method
Standard published on 24.8.2006
Selected format:Methods for chemical analysis of lead concentrates—Part 6:Determination of bismuth content
Standard published on 28.3.2025
Selected format:Methods for chemical analysis of lead concentratesDetermination of copper contentFlame atomic absorption spectrometric method
Standard published on 24.8.2006
Selected format:Methods for chemical analysis of lead concentratesDetermination of magnesium oxide contentFlame atomic absorption spectrometric method
Standard published on 24.8.2006
Selected format:Round nuts with set pin holes in side
Standard published on 24.6.1988
Selected format:Seamless steel tubes for structural purposes
Standard published on 14.5.2018
Selected format:Seamless steel pipes for liquid service
Standard published on 14.5.2018
Selected format:Latest update: 2026-04-30 (Number of items: 2 275 280)
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