ceramic flap disc  are made ​​of clay , quartz and feldspar minerals and other natural ingredients formulated according to different formulas , processed , forming and firing derived , its chemical composition depends on the use of natural raw materials and formulations , in different parts of ancient ceramics kilns because the raw materials used different , different formulations and different firing process , the glaze chemical composition, microstructure and physical properties will have their own characteristics . If the collection of different kilns reliable stratigraphic excavations ceramic specimens were systematically studied , the accumulated data such as chemical composition data ( including major and minor element concentrations and trace elements ) to establish a database , and use the appropriate processing methods, such as multivariate statistical analysis and other methods for data processing, to identify a characteristic sense of the law. Ceramic want to identify the chemical composition, microstructure, physical properties , and firing process and other aspects of research , and its chemical composition data with known kilns and chronology of ancient ceramics to compare the chemical composition data processing , and then integrated microstructure, physical properties , and firing process and other aspects of information may make an appraisal of ceramics .