... High Spalling Resistance High Softening Temperature Furnace Al2O3 Alumina Ceramic Tubes High Purity Alumina Ceramic Tube are widely used in thermocouple protections ... furnace(containing vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.Furnace tube ...