Abstract
The objective of this study was to clarify the casting rate, the surface roughness and acuracy of ethyl silicate by comparing those of other investments.The accuracy here means those of simple gypsum model and the metal plate.The results obtained were summarized as follows:1. In the experiment of the casting rate, ethyl silicate was effective in using chromiumcobalt alloy.2. In making of the test piece, it was possible to reduce the working hours considerably in case of ethyl silicate. The surface roughness of the test piece by using ethyl silicate was almost the same or less compared to the conventional ones.3. Judging from the results of the first and the second experiments, the capacity of ethyl silicate was effective in many points. But in the experiment of the accuracy, it showed that there was mainly a little shrinkage toward X-axis, Y-axis and had a tendancy to rise to the surface toward Z-axis. That is, ethyl silicate was not so good in the accuracy.
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