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Standards GB - Chinese national standards - Page 7295
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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GBN 259-1986
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WITHDRAWN published on 1.1.1986
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GB/T 2590.1-1981
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Zirconium and hafnium oxides--Determination of zirconium (hafnium) oxide contents--Mandelic acid gravimetric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.10-1981
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Zirconium oxides--Determination of manganese oxide content--Potassium periodate photometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.11-1981
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Zircoium oxide--Determination of nickel content--22’-Furil dioxime absorption photometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.2-1981
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Zirconium and hafnium oxides--Determination of iron content--Sulfosalicylic acid photometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.3-1981
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Zirconium and hafnium oxides--Determination of silicon content--Silicon-molybdenum blue photometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.4-1981
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Zirconium and hafnium oxides--Determination of aluminium content--Chromazurol S-tetradecyl pyridine chloride photometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.5-1981
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Zirconium and hafnium oxides--Determination of sodium content--Flame atomic absorption spectrophotometric method
WITHDRAWN published on 7.6.1981
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GB/T 2590.6-1981
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Zirconium and hafnium oxides--Determination of titanium content--Diantipyrymethane photometricmethod
WITHDRAWN published on 7.6.1981
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GB/T 2590.7-1981
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Zirconium and hafnium oxides--Determination of phosphorus content--Ascorbic acid reduced molybdoantimonyl phosphoric acid absorption photometric method
WITHDRAWN published on 7.6.1981
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