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Alumina Bubble Insulating fire bick Composition: Alumina HollowSphere Insulating Refractory Bricks are madeof high pure alumina hollowSphere and alumina micro-powder as the main material in addition with some additive. By shaping at high pressure,sintering at high temperature. Features: This series of products are characterized by low bulk density,high cold crushing strength,low thermal conductivity,good mechanical impact and vibration resistance and good corrosion resistance,which can improve the service life of furnace greatly.With features of both heavy and light weight refractory products. Application It is a kind of perfect energy-saving material widely used in synthetic ammonia furnace,ethylene gas-making furnace and high temperature shuttle furnace.They boast strong resistance ability to subversive gas and slag .The maximum service is 1800oC. Specand type DFMQ1.5DFLQ1.5DFLQ1.7Bulk Density (g/m3)≤ 1.51.51.7Cold Crushing Strength(Mpa)≥ 8.08.010.0Thermal Shock Resistance(1100 water quening,cycles) 20------------------------Test Temperature at whichPLC≤0.5%(×h) 1650×81700×81750×8Thermal Conductivity350±25(W/m.k) 0.650.650.65Al2O3 % ≥ 859898 Note:1.The The data of thermal conductivity is obtained by flat test. We can aslo produce according tothe requested specification.