Die soldering defects is a condition that often occurs in casting processes that can cause damage to the dies and poor quality of casting products. The use of zirconium silicate (ZrSiO2) as the main refractory coating material requires high cost so that substitution material is needed to reduce production cost. Kaolin can be used as an alternative because, it has a high melting temperature and kaolin also prevents precipitation from other ingredients. The purpose of this study is to determine the effect of variations in the concentration of kaolin as partial filler on ceramic coating. The process of preheat and without preheat is also done on each sample. The analysis in this study includes Particle Size Analyzer (PSA), viscosity, thermal analysis by using Differential Thermal Analysis (DTA), picture taken by Scanning Electron Microscope (SEM) equipped with EDX to determine material content of the coating material. The results showed that kaolin can be used as an additional material for filler coating. The addition of kaolin concentration and heat treatment is the best result of viscosity an heat resistance.
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