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The aim of this work was to determine the properties of vitreous ceramic sanitary ware bodies according to the production of Khon Kaen ceramic sanitary ware industry, Thailand. Pottery stone was used as a replacing material in the commercial ceramic sanitary ware body formulation. The cast slurry of seven formulations was prepared by wet milling. The rheological properties (density and torsion viscosity) were investigated before slip casting. The test pieces were fired at 1175, 1200 and 1225๐C and the physical-mechanical properties (firing shrinkage, flexural strength, and water absorption) were compared. As a result, pottery stone shows a possibility to replace quartz in the production. It could enhance all of the good properties at lower firing temperature. Using of pottery stone could reduce production cost in term of energy fuel by 4.45% when compared with commercial formulation.

The aim of this work was to determine thermal and physical properties of white-opaque sanitary glazes. Lampang pottery stone was used to replace silica (G2) and feldspar (G3) in the commercial sanitary glaze (G1). All formulations of glazes developed from Seger formula calculation and the glaze slurry was prepared by wet milling, green glazing on commercial ceramic body and firing at 1200๐C with heating rate of 3๐C/min by using electric kiln. Melting characteristics, specular gloss, lightness, color, and thermal expansion behavior of all sanitary glazes were investigated. As a result, the glaze G2 was a good reflecting surface with high lightness value. Linear thermal expansion difference at 500๐C between the glaze G2 and the commercial ceramic body was-0.015%. This glaze-body fit was, therefore, under small compression and more compatible to ceramic sanitary products.

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