... corrosion resistant, basic product raw materials, such as high alumina refractory materials, polishing, grinding, electroceramics devices and spark ... are as follows:1) Refractory brick. Fireclay brick, High alumina brick, Silica brick, Mullite brick, Magnesia brick, ... bricks.2) Castable series. Low cement castable, High alumina castable, Silica castable, Corundum castable, Light weight insulation ...