MTI Corporation provides high-purity Alumina (Al₂O₃ ) tubes as replacement parts for high-temperature tubing furnaces in universities, companies, and national labs. It comes with the specifications as the following:

Purity	Al2O3 > 99%, SiO2 < 0.25%, CaO+MgO < 0.3%
Density	> 3.7 g /cm3
Nominal Dimensions	OD40 × ID30 × L 700 ( mm)    ( OD 1.57" x ID 1.18" x L 23.6" )
Detailed Dimensions
Working Temperature	<1700°C at ambient pressure <1500°C under vacuum
Heating and Cooling Rate	<10°C/min at T<1200°C <5°C/min at 1200°C<T<1700°C
Max Temperature Gradient	<100°C/in
Application Notes	MTI recommends using alumina crucibles for samples to extend the service life of the tube and avoid cross-contamination.  To order crucibles, please click here.

Inspect your delivery:
Please check the package's condition upon delivery. 
Should any damage is found, please keep all packaging materials, take pictures, and report immediately to MTI within 15 days of delivery.