Standards GB - Chinese national standards - Page 478

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 15059-1994

Method for determining the water expansion and shrinkage of photographic film base

Standard published on 5.5.1994

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GB/T 1506-2016

Manganese ores—Determination of manganese content—Potentiometric method and ammonium iron() sulphate titrimetric method

Standard published on 29.8.2016

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GB/T 15061-1994

General specifications for sensitometry of silver halide photographic materials--Part 1:Sensitometric exposure conditions of films to be exposured for incandescent tungsten and daylight

Standard published on 5.5.1994

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GB/T 15062-2025

Wrought superalloy—Seamless tube

Standard published on 29.8.2025

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