This standard applies to the determination of the amount of calcium oxide in clay refractory products and high alumina refractory materials.
GB/T 6900.6-1986 history
2016GB/T 6900-2016 Chemical analysis of alumina-silica refractories
2006GB/T 6900-2006 Chemical analysis of alumina-silica refractories
1986GB/T 6900.6-1986 Fireclay and high-alumina refractories--Determination of calcium oxide content--EDTA volumetric method
GB/T 6900.6-1986 Fireclay and high-alumina refractories--Determination of calcium oxide content--EDTA volumetric method was changed to GB/T 6900-2006 Chemical analysis of alumina-silica refractories.