... middle or high level iron runner casting material, gunning refractory and fabricate parts ect. It also can be used ... of corundum products, such as corundum bricks, corundum, mullite corundum, refining corundum perforated bricks, overall blowtorch and combined nozzle, side ... 9 3.Usage: as the refractories materials used for refractory,abrasives,polishing,grinding,and petrol chemical industry,etc.4. ...