GB/T 4984-2007

Compared with the original standard, the main changes of this standard are as follows: - The contents of the original two standards are integrated together, and the relevant content of YB/T 4078—2003 "Chemical Analysis Methods for Zirconia Refractory Materials" is included. The analysis components are arranged by chapters, and the standard name is modified at the same time; - Detailed provisions are made for sample preparation, increasing its operability; - The provisions on the rounding of analysis values are added, and the use of other provisions is allowed; - The acceptance and processing procedures for analysis results are added; - The measurement range of the analysis method is expanded; - The allowable deviations of the analysis method are modified; - The method of determining low content of Al2O3 by chromotropic S spectrophotometry is added.