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Standards GB - Chinese national standards - Page 120
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 11450.1-1989
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Hollow metallic waveguides--Part 1:General requirement and measuring methods
Standard published on 22.6.1989
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GB/T 11450.2-1989
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Hollow metallic waveguides--Part 2:Relevant specifications for ordinary rectangular waveguides
Standard published on 22.6.1989
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GB/T 11450.3-1989
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Hollow metallic waveguides--Part 3:Relevant specifications for flate rectangular waveguides
Standard published on 30.6.1989
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GB/T 11450.4-1989
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Hollow metallic waveguides--Part 4:Relevant specifications for circular waveguides
Standard published on 30.6.1989
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GB/T 11450.5-1989
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Hollow metallic waveguides--Part 6:Relevant specifications for medium flat rectangular waveguides
Standard published on 30.6.1989
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GB/T 11450.6-1989
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Hollow metallic waveguides--Part 7:Relevant specifications for square waveguides
Standard published on 30.6.1989
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GB/T 11451-1989
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Flexible waveguide assembly performance
Standard published on 30.6.1989
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GB/T 11457-2006
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Information technology Software engineering terminology
Standard published on 14.3.2006
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GB/T 1146-2009
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Bubble
Standard published on 30.9.2009
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GB/T 11460-2025
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Information technology—Requirements and test method for the Chinese ideograms font
Standard published on 5.10.2025
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