China Stainless Steel Casting factory Silica sol precision casting is a casting process that uses silica sol investment to make castings. Silica sol investment is a casting mold with silica sol zircon sand as the modeling material. First, make a wax mold (fire mold) with fusible paraffin wax and stearic acid, and then coat the wax mold with silica sol zircon sand and refractory powder to make a...