... acid and alkali corrosion 1.Xinmi Jinding keep warm refractory co.,ltd,dealing in thermal insulation in this line ... middle or high level iron runner casting material, gunning refractory and fabricate parts ect. It also can be used to ... kinds of corundum products, such as corundum bricks, corundum, mullite corundum, refining corundum perforated bricks, overall blowtorch and combined nozzle, side ...