| 摘要 |
<p>TITLE OF THE INVENTION POWDERED FACING AGENT A powdered facing agent for use in forming a shell mold, which is composed of a powdered refractory, such as silica, alumina, zircon, silex, magnesia, etc., a novolak type phenol resin, a resol type phenol resin and/or vinyl acetate resin.</p> |
