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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 tungsten--The inert gas fusion-coulometric titration method for the determination of oxygen content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten--The Nessler reagent photometric method for the determination of nitrogen content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysisof tungsten--The combustion-coulometric titration method for the determinationof carbon content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten--The thiocy anate photometric method for the determin-ation of molybdenum content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten--The gravimetric method for the determination of residue content after chloride volatility
WITHDRAWN published on 12.4.1984
Selected format:Methods forchemical analysis of tungsten--The polyethylene glycol octyl phenylether-phenylfluorone photometric method for the determination of tin content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten--The gravimetric method for the determination of loss content on ignition
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten--The malachite green photometric method for the determination of antimony content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten--The molybdenum blue photometric method for the determination of arsenic content
WITHDRAWN published on 12.4.1984
Selected format:Methods for chemical analysis of tungsten—Part 5:Determination of arsenic content—Hydrogenate atomic absorption spectrometry
WITHDRAWN published on 31.12.2012
Selected format:Latest update: 2026-01-26 (Number of items: 2 257 479)
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