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Standards GB - Chinese national standards - Page 8256
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 5069.11-2001
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Chemical analysis of magnesia and magnesia-alumina refractory materials—Complexometric titration method for determination of calcium oxide and magnesium oxide content
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GB/T 5069.12-2001
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Chemical analysis of magnesia and magnesia-alumina refractory materials—Flame atomic absorption spectrometric method for determination of manganese oxide content
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GB/T 5069.13-2001
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Chemical analysis of magnesia and magnesia-alumina refractory materials—Flame atomic absorption spectrometric method for determination of potassium oxide and sodium oxide content
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GB/T 5069.2-1985
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Magnesite refractories--Determination of silicon dioxide content--Molybdenum blue photometric method
WITHDRAWN published on 1.1.1985
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GB/T 5069.2-2001
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Chemical analysis of magnesia and magnesia-alumina refractory materials—Molybdenum blue photometric method for determination of silicon dioxide content
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GB/T 5069.3-1985
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Magnesite refractories--Determination of silicon dioxide content--Gravimetric molybdenum blue photometric method
WITHDRAWN published on 1.1.1985
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GB/T 5069.3-2001
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Chemical analysis of magnesia and magnesia-alumina refractory materials—Gravimetric-molybdenum blue photometric method for determination of silicon dioxide content
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GB/T 5069.4-1985
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Magnesite refractories--Determination of iron oxide content--O-phenanthroline photometric method
WITHDRAWN published on 1.1.1985
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GB/T 5069.4-2001
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Chemical analysis of magnesia and magnesia-alumina refractory materials—Ortho-phenanthroline photometric method for determination of iron oxide content
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GB/T 5069.5-1985
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Magnesite refractories--Determination of aluminium oxide content--Chromazurol S photometric method
WITHDRAWN published on 1.1.1985
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