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Standards GB - Chinese national standards - Page 233
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 1282-2013
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Chemical reagentPhosphoric acid
Standard published on 31.12.2013
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GB/T 12823.1-2008
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Photography - Density measurement - Part 1: Terms, symbols and notations
Standard published on 24.9.2008
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GB/T 12823.3-2025
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Photography and graphic technology—Density measurements—Part 3:Spectral conditions
Standard published on 1.8.2025
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GB/T 12823.4-2008
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Photography - Density measurement - Part 4: Geometric conditions for reflection density
Standard published on 24.9.2008
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GB/T 12825-2003
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Polymeric materialscellular flexible--Determination of hardness by indentation technique
Standard published on 10.1.2003
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GB/T 12827-2008
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Standard reference acetylene blank and standard practice for evaluation
Standard published on 18.6.2008
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GB/T 12828-2006
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Rubberraw and unvalcanized compounded - Determination of plasticity number and recovery number - Parallel plate method
Standard published on 29.12.2006
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GB/T 12829-2006
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Rubber, vulcanized or thermoplastic - Determination of tear strength of small test pieces (Delft test pieces)
Standard published on 1.9.2006
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GB/T 12830-2008
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Rubbervulcanized or thermoplastic - Determination of shear modulus and adhesion to rigid plates - Quadruple shear methods
Standard published on 4.6.2008
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GB/T 12832-2008
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Rubber-Determination of crystallization effects by hardness measurements
Standard published on 1.4.2008
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