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Standards GB - Chinese national standards - Page 7463
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 8638.13-1988
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Nickel base alloy powder—Determination of oxygen content—Pulse heating inert gas fusion coulometric titrimetric method
WITHDRAWN published on 11.1.1988
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GB/T 8638.2-1988
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Nickel base alloy powder—Determination of aluminium content—Chrome azurol S spectrophotometric method
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GB/T 8638.3-1988
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Nickel base alloy powder—Determination of silicon content—Gravimetric method after dehydration by perchloric acid
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GB/T 8638.4-1988
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Nickel base alloy powder—Determination of chromium content—Persulfate oxidation titrimetric method
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GB/T 8638.5-1988
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Nickel base alloy powder—Determination manganese content—Sodium (potassium periodate spectrophotometric method)
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GB/T 8638.6-1988
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Nickel base alloy powder—Determination of iron content—Titanium trichloride-potassium dichromate titrimetric method
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GB/T 8638.7-1988
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Nickel base alloy powder—Determination of cobalt content—Nitroso-R salt spectrophotometric method
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GB/T 8638.8-1988
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Nickel base alloy powder—Determination of copper content—Neocuproine-chloroform extraction spectrophotometric method
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GB/T 8638.9-1988
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Nickel base alloy powder—Determination of copper content—Thiosulfate-iodimetric method
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GB/T 8639.1-1988
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Vanadium—Determination of vanadium content—Potassium permanganate-ammonium ferrous sulphate volumetric method
WITHDRAWN published on 8.2.1988
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