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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
Chemical analysis methods and determination of physical performance of alumina--Preparation andstorage of test samples
Standard published on 5.2.2004
Selected format:Chemical analysis methods and determination of physical performance of alumina--Measurement of the angle of repose
Standard published on 5.2.2004
Selected format:
Chemical analysis methods and determination of physical performance of alumina—Part 24: Measurement of the angle of repose and the angle of flow
Execute Date: december 2026
Standard published on 25.5.2026
Selected format:Chemical analysis methods and determination of physical performance of alumina—Part 25:Method for the determination of tapped and untapped density
Standard published on 6.8.2023
Selected format:Chemical analysis methods and determination of physical performance of alumina--Determination of absolute density--Pycnometer method
Standard published on 5.2.2004
Selected format:Chemical analysis methods and determination of physical performance of alumina—Part 27:Particle size analysis—Sieves method
Standard published on 6.8.2023
Selected format:Chemical analysismethods and determination of physical performance of alumina--Determination of an absorption index
Standard published on 5.2.2004
Selected format:Chemical analysis methods and determination of physical performance of alumina--Determination of silicon dioxide content--Molybdenum blue photometric method
Standard published on 5.2.2004
Selected format:Chemical analysis methods and determination of physical performance of alumina—Part 30: Determination of trace elements—Wavelength dispersive X-ray fluorescence spectrometric method
Standard published on 9.3.2022
Selected format:Chemical analysis methods and determination of physical performance of alumina - Part 31: Determination of angle of flow
Standard published on 15.4.2009
Selected format:Latest update: 2026-08-07 (Number of items: 2 292 304)
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