Brown Fused Alumina is produced by fusion of calcined bauxite in an electric arc furnace at over 2000 centigrade. It stands out due to very high toughness and durable working life RBT are produced by selected the high purity bauxite with accurately fusion control which achieve lowest unstable foreign oxide and free carbon and sulfur contents. The chemical compositions of RBT strictly design for vitrified application, so that RBT is completely reliable product for vitrified abrasives.