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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
Rare earth three-band phosphors for fluorescent lamps
WITHDRAWN published on 19.11.2002
Selected format:Measuring methods of rare-earth phosphorus with red,green,blue luminescence for fluorescent lamp--Measuringmethod of relative brightness
WITHDRAWN published on 15.9.1993
Selected format:Test methods of rare earth three-band phosphors for fluorescent lamps—Determination of relative brightness
WITHDRAWN published on 19.11.2002
Selected format:Rare-earth phosphors with red,green,blue luminescencefor fluorescent lamp--Measuring method of chromaticity coordinates
WITHDRAWN published on 15.9.1993
Selected format:Test methods of rare earth three-band phosphors for fluorescent lamps—Determination of emission spectrum and chromaticity
WITHDRAWN published on 19.11.2002
Selected format:Test methods of rare earth three-band phosphors for fluorescent lamps—Determination of thermostability
WITHDRAWN published on 19.11.2002
Selected format:Test methods of rare earth three-band phosphors for fluorescent lamps—Determination of particle size distribution by electric sensing zone technique
WITHDRAWN published on 19.11.2002
Selected format:Test methods of rare earth three-band phosphors for fluorescent lamps—Determination of density
WITHDRAWN published on 19.11.2002
Selected format:Test methods of rare earth three-band phosphors for fluorescent lamps—Determination of specific surface area
WITHDRAWN published on 19.11.2002
Selected format:Rare earth metals and their compounds—Determination of total rare earth contents
WITHDRAWN published on 17.6.2008
Selected format:Latest update: 2026-06-09 (Number of items: 2 281 484)
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