الوصف

Structure：protecting tubes including closed and general types; insulating tubes including circular and elliptical types, or single, double and multiple holes types; other tubes including screw thread tubes and lozenge tubes.
Materials：high aluminum, corundum
Uses：protecting and insulating tubes for thermocouples measuring temperature; furnace tubes in industrial resistance furnaces, experimental electric furnaces and heat treatment furnaces; ferrous chemical carbon and sulphur analyzing tubes; other instruments and meters resistant against high temperature and acid and alkali.
Features：high mechanical strength, good heat conductivity, good performance of insulation and high frequency in high temperature, resistance against chemical corrosion.
Airtight Property：pressure lowering smaller than 3% kept *0 minutes in air pressure of 0.1MPa.
Heat Insulation:Put the tube **0mm into the furnace of ***0℃ for *0 minutes, it won't bend, become viscous or soft.
Resistance against temperature sharp change:Heat the tube to ***0℃, keep the temperature for *0 minutes then take it out and cool it to room temperature. After successive 3 times, the tube won't break apart or peel.
Resistance against acid and alkali:After boiling it for *5 hours in NA2CO3 solution of 2N consistence, the weight loss is less than *0mg/cm2.