| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an agent which can lubricate the surface of a gypsum model or a gypsum investiment material model. <P>SOLUTION: The water solution for lubrication provided for lubricating the surface of the gypsum model or the gypsum investiment material model includes at least 0.01 mass% of one or two or more kinds selected from the group consisting of aluminum potassium sulfate, aluminum sulfate, iron ammonium sulfate, ammonium aluminum sulfate, chromium ammonium sulfate, sodium aluminum sulfate and their solvates, and has pH 4 or less. <P>COPYRIGHT: (C)2013,JPO&INPIT |
