Casting Process: silica sol of lost wax investment casting Dimension Tolerance: CT5-CT7 Surface Roughness: Ra6. ... appliance, electronic fitting, military equipment, etc 3. Standard: the dimension tolerance of the product may reach CT3-CT6class 4. Surface roughness: Ra6 ... , nickel-plated, chrome-plated, hot-galvanized, sandblasting, painting, powder-coating, Lost wax casting stainless steel Impeller