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Standards GB - Chinese national standards - Page 8279
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 5686.1-2008
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Ferromanganese,ferromanganese-silicon,nitrogen-bearing ferromanganese and manganese metal—Determination of manganese content—Potentiometric method and titrimetric mothod after ammonium nitrate & perchloric acid oxidation
WITHDRAWN published on 13.5.2008
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GB/T 5686.2-1985
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Methods for chemical analysis of silicomanganese alloy—The gravimetric method for the determination of silicon content
WITHDRAWN published on 4.12.1985
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GB/T 5686.2-2008
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Ferromanganese,ferromanganese-silicon,nitrogen-bearing ferromanganese and manganese metal—Determination of silicon content—Molybdenum blue photometric method,silicon potassium fluoride titrimetric method and perchloric acid dehydration gravimetric method
WITHDRAWN published on 13.5.2008
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GB 5686.3-1988
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WITHDRAWN published on 1.1.1988
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GB 5686.4-1985
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WITHDRAWN published on 1.1.1985
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GB/T 5686.4-1998
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Methods for chemical analysis of silicomanganese—The phosphomolybdenum blue phtometric method for the determination of phosphorus content
WITHDRAWN published on 14.12.1998
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GB/T 5686.4-2008
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Ferromanganese,ferromanganese-silicon,itrogen-bearing ferromanganese and manganese metal—Determination of phosphorus content—Molybdenum blue photometric method and alkali content titrimetric method
WITHDRAWN published on 13.5.2008
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GB/T 5686.5-1988
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Methods for chemical analysis of silicomanganese alloy—The infrared absorption method for the determination of carbon content
WITHDRAWN published on 21.2.1988
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GB/T 5686.5-2008
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Ferromanganese,ferromanganese-silicon,nitrogen-bearing ferromanganese and manganese metal—Determination of carbon content—The infrared absorption method,the gasometric method,the gravimetric and the coulometric method
WITHDRAWN published on 13.5.2008
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GB/T 5686.6-1988
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Methods for chemical analysisof silicomanganese alloy--The gasometric method for the determination of carbon content
WITHDRAWN published on 21.2.1988
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