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Standards GB - Chinese national standards - Page 199
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 12514.1-2005
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Fire couoling -- Part 1: General technical conditions for fire coupling
Standard published on 28.9.2005
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GB 12514.2-2006
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Fire coupling - Part 2: Patterns and basic parameters for fire snap-types coupling
Standard published on 26.1.2006
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GB 12514.3-2006
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Fire coupling - Part 3: Patterns and basic parameters for fire insertion-type coupling
Standard published on 26.1.2006
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GB 12514.4-2006
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Fire coupling - Part 4: Patterns and basic parameters for fire screw-type coupling
Standard published on 26.1.2006
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GB/T 12519-2021
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General specification of analytical instruments
Standard published on 11.10.2021
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GB/T 12520-1990
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Offset cruciform recess for rotary fastening devices
Standard published on 3.11.1990
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GB/T 12521-2008
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Technical requirements for air diving decompression
Standard published on 27.5.2008
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GB/T 12522-2009
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Stainless steel bellows expansion joints
Standard published on 9.3.2009
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GB 12523-2011
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Emisson standard of environment noise for boundary of construction site
Standard published on 30.12.2011
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GB 12523-2025
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Emission standard for construction noise
Standard published on 2.12.2025
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