Casting Process: silica sol of lost wax investment casting Dimension Tolerance: CT5-CT7 Surface Roughness: Ra6.4~12.5 ... Specification s of investment casting parts: 1. Materials:carbon steel, alloy steel, stainless steel, brass, brozen and other special ... , chrome-plated, hot-galvanized, sandblasting, painting, powder-coating, Lost wax casting stainless steel Impeller