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Standards GB - Chinese national standards - Page 8372
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 6150.2-1985
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Methods for chemical analysis of tungsten concentrates—The potassium iodate volumetric method for the determination of tin content
WITHDRAWN published on 21.6.1985
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GB/T 6150.2-2008
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Methods for chemical analysis of tungsten concentrates—Determination of tin content—The potassium iodate volumetry and hydrogenate atomic absorption spectrometry
WITHDRAWN published on 17.6.2008
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GB/T 6150.3-1985
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Methods for chemical analysis of tungsten concentrates—The salicylfluorone-tetradecyl pyridine chloride photometric method for the determination of tin content
WITHDRAWN published on 21.6.1985
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GB/T 6150.3-2009
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Methods for chemical analysis of tungsten concentrates—Determination of phosphorus content—The phosphorus molybdenum yellow spectrophotometry
WITHDRAWN published on 30.10.2009
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GB/T 6150.4-1985
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Methods for chemical analysis of tungsten concentrates—The molybdenum yellow photometric method for the determination of phosphorus content
WITHDRAWN published on 21.6.1985
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GB/T 6150.4-2008
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Methods for chemical analysis of tungsten concentrates—Determination of sulfur content—The high frequency-infrared absorption method
WITHDRAWN published on 31.3.2008
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GB/T 6150.5-1985
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Methods for chemical analysis of tungsten concentrates—The barium sulfate gravimetric method for the determination of sulfur content
WITHDRAWN published on 21.6.1985
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GB/T 6150.6-1985
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Methods for chemical analysis of tungsten concentrates—The EDTA volumetric method for the determination of calcium content
WITHDRAWN published on 21.6.1985
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GB/T 6150.6-2008
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Methods for chemical analysis of tungsten concentrates—Determination hygroscopic moisture content—Gravimetric method
WITHDRAWN published on 31.3.2008
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GB/T 6150.7-1985
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Methods for chemical analysis of tungsten concentrates—The atomic absorption spectrophotometric method for the determination of calcium content
WITHDRAWN published on 21.6.1985
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