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Standards GB - Chinese national standards - Page 95
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 11239.1-2025
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Optics and photonics—Operation microscopes—Part 1: Requiremnts and test methods
Execute Date: july 2027
Standard published on 30.6.2025
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GB/T 11239.2-2026
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Optics and photonics—Operation microscopes—Part 2:Light hazard from operation microscopes used in ocular surgery
Execute Date: may 2029
Standard published on 2.7.2026
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GB/T 1124.1-2007
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Convex and concave milling cutters - Part1The types and dimensions
Standard published on 25.6.2007
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GB/T 1124.2-2007
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Convex and concave milling cutters - Part 2Technical specifications
Standard published on 25.6.2007
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GB/T 11251-2025
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Alloy structural steel plate, sheet and strip
Standard published on 31.10.2025
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GB/T 11253-2019
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Cold-rolled sheet and strip of carbon structural steels
Standard published on 18.10.2019
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GB/T 11259-2015
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Non-destructive testing—Practice for fabrication and control of steel reference blocks used in ultrasonic testing
Standard published on 9.10.2015
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GB/T 11260-2023
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Method for eddy current testing of round steel
Standard published on 7.9.2023
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GB/T 11261-2006
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Steel and iron Determination of oxygen content The pulse heating inert gas fusion-infra-red absorption method
Standard published on 2.3.2006
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