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Feldspars Used in Ceramic Glazes and Clay Making
Posted By Ceramic Arts Daily On April 16, 2009 @ 12:22 pm In Ceramic Raw Materials | No Comments
|Feldspars are important ingredients in clay bodies and glazes. In both applications, their primary function is to supply ?uxes to the formulations, but they also provide additional alumina (Al2O3) and silica (SiO2). Feldspars are naturally occurring minerals and are generally classi?ed as either potash (potassium) or soda (sodium) feldspars based upon the predominant alkali metal element (the ?ux) that is present. The minerals commonly referred to as lithium feldspars are not true feldspars, but they are aluminosilicates like feldspars and contain the ?uxing element lithium, and are used for the same purposes as the feldspars.|
The analyses will allow you to compare the compositions of different raw materials when it is desirable to make substitutions in clay body and glaze recipes. The weight percent values will be useful in the conversion of glaze recipes from Seger molecular formulas to weight percent recipes when using these raw materials. The theoretical formulas and molecular weights for the different types of minerals present in the products are as follows:
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