... 3)Application:auto,toy,electronic 4)Certificate: SGS Spring Roll Features 1.Material:steel,stainless steel.brass,aluminum,brass.cooper ... Euipmentspectrum analyzer, Physio-chemicalLabora tory 9Production lines1) The lost-wax casting of stainless steel and heat-resisting steel with silica ... alloy steel with water glass shell made of low-temperature wax material;3) The resin sand casting of ductile iron ...