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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
Chemical analysis methods for rare earth concentrates—Part 3: Determination of calcium oxide content
Standard published on 1.8.2025
Selected format:Chemical analysis methods of rare earth concentrates - Part 4Determination of niobium oxide, zirconium oxide and titanium oxide contents - Inductively coupled plasma atomic emission spectrometry
Standard published on 14.1.2011
Selected format:Chemical analysis methods of rare earth concentrates - Part 5Determination of aluminum oxide content - Inductively coupled plasma atomic emission spectrometry
Standard published on 14.1.2011
Selected format:Chemical analysis methods of rare earth concentrates - Part 6Determination of silicon oxide content
Standard published on 14.1.2011
Selected format:Chemical analysis methods of rare earth concentrates - Part 7Determination of iron oxide content - Potassium dichromate titration
Standard published on 14.1.2011
Selected format:Chemical analysis methods for rare earth concentrates—Part 8: Determination of rare earth oxide contents and distribution
Standard published on 1.8.2025
Selected format:Chemical analysis methods for rare earth concentrates—Part 9: Determination of phosphorus pentoxide content
Standard published on 1.8.2025
Selected format:Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 1: Determination of cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium contents in lanthanum metal and oxide
Standard published on 19.11.2020
Selected format:Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Holmium-Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, erbium, thulium, ytterbium, lutetium and yttrium contents
Standard published on 13.4.2006
Selected format:Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Erbium-Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, thulium, ytterbium, lutetium and yttrium contents
Standard published on 13.4.2006
Selected format:Latest update: 2026-09-09 (Number of items: 2 300 143)
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