1. 30% more service time,high strength. 2. 20 years experience. 3. Custom-made supplied,sampls avaible. 4. 15% energy saving. Product DescriptionMullite insulating bricks characteristics and advantages: 1. Lower content of iron, alkaline and impurities, good high temperature properties. 2. Homogeneous structure, light weight, energy saving because lower heat storage in the furnace during cooling ...