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Standards GB - Chinese national standards - Page 5744
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 12689.13-1990
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Zinc and zinc alloys—Determination of aluminium content—Electrothermal atomic absorption spectrometric method
WITHDRAWN published on 30.12.1990
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GB/T 12689.14-1990
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Zinc and zinc alloys—Determination of aluminium content—Chromazurol S spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12689.2-1990
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Zinc and zinc alloys—Determination of copper content—Lead diethyldithio-carbamate spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12689.3-1990
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Zinc and zinc alloys—Determination of iron content—Sultosalicylic acid spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12689.4-1990
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Zinc and zinc alloys—Determination of arsenic content—Molybdenum blue spectrophotometric method
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GB/T 12689.5-1990
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Zinc and zinc alloys—Determination of silicon content—Molybdenum blue spectrophotometric method
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GB/T 12689.6-1990
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Zinc and zinc alloys—Determination of tin content—Phenylfluorone-cetyltrimethyla-mmonium bromide spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12689.7-1990
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Zinc and zinc alloys—Determination of magnesium content—Flame atomic absorption spectrometric method
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GB/T 12689.7-2004
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The methods for chemical analysis of zinc and zinc alloys—The determination of magnesium content—The flame atomic absorption spectrometric method
WITHDRAWN published on 30.4.2004
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GB/T 12689.8-1990
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Zinc and zinc alloys—Determination of iron content—Flame atomic absorption spectrometric method
WITHDRAWN published on 30.12.1990
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