alumina protecting tubes

We mainly produce alumina tubes, rods and various industrial ceramic parts, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial 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. Main performance indexSerial numberperformance indexMeasuring unitHigh purity aluminaAluminaHigh alumina1Al2O3%99.799.3852SiO2%less than0.1——3Densityg/cm33.953.883.24Wter absorption%00.010.25Cld compressive strengthMPa450350200620 degree Celsius leak ratesTorr/L.secless than10-11less than10-11less than10-117Twisting in high temperaturemm1700 degree Celsius 0.2 allowance1600 degree Celsius 0.2 allowance1400 degree Celsius 0.2 allowance8Bonding in high temperature1700 degree Celsius non-caked1600 degree Celsius non-caked1400 degree Celsius non-caked920—1000 degree Celsius coefficient ofthermal expansionmm.10-6/degree Celsius.m8.68.28.210Thermal conductivityW/m.k25252511Electric insulation strengthKV/mm2020151220 degree Celsius direct currentinsulating resistanceOhm/cm10141014101413High-temperatureinsulation resistance1000 degree Celsius MΩ≥0.08≥0.08≥0.081300 degree Celsius MΩ≥0.02≥0.02≥0.0214Thermal shock resistance1550 degree Celsius 6 times not cracked1550 degree Celsius 6 times not cracked1300 degree Celsius 3 times not cracked15Maximum service temperaturedegree Celsius190018001400