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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
Unplasticized poly(vinyl chloride) (PVC-U) fittings for soil and waste discharge inside buildings
Standard published on 28.12.2018
Selected format:Fluid coupling - Types and basic specifications
Standard published on 11.8.2008
Selected format:Phosphors—Part 1: Terminology
Standard published on 15.5.2015
Selected format:Phosphors—Part 2: Types
Standard published on 15.5.2015
Selected format:Phosphors—Part 3: Test methods for properties
Standard published on 15.5.2015
Selected format:Phosphors—Part 4-1: Phosphors for black-white picture tubes
Standard published on 15.5.2015
Selected format:Phosphors—Part 4-2: Phosphors for indicator tubes
Standard published on 15.5.2015
Selected format:Phosphors—Part 4-3: Phosphor for oscilloscope tubes and display tubes
Standard published on 15.5.2015
Selected format:Phosphors—Part 4-4: Phosphor for color picture tubes
Standard published on 15.5.2015
Selected format:Phosphors—Part 4-5 : Phosphor for color display tubes
Standard published on 15.5.2015
Selected format:Latest update: 2026-06-25 (Number of items: 2 284 379)
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