Refractory materials are non-metallic substances that maintain their properties at high temperatures over 1,000ยฐF, and are used to line furnaces, heaters, incinerators and reactors. They are also used to make pots and molds for glass and metals, and to surface rocket launch structures. High alumina refractories are a type of refractory material commonly used by industries like iron, steel and glass manufacturing due to their ability to withstand high heat.