3/8" OD larger diameter Alumina tube is made of high purity 95% Al₂O₃ material. 995 alumina tubes can be used at operating temperatures to 1700^oC in both oxidizing and reducing atmospheres. Tubes have been evacuated to 10^-7 Torr at room temperature. 995 alumina tube proves inert to carbon and refractory metals in many severe situations:

SPECIFICATIONS

Purity	Al2O3 > 95%, SiO2 < 0.25%, CaO+MgO < 0.3%
Density	> 3.91 g /cm3
I.D	1.97"+/- 0.079 (50 +/- 4 mm)
O.D	2-3/8"+/- 0.094 (60.6 +/- 4 mm)
Length	1200 mm (48"")
Detailed dimension drawing
Max. working temperature	1700 °C (3092°F)
Warning	Do NOT use an alumina tube under a vacuum at a temperature > 1500°C. Max heating or cooling rate < 5°C/ minute. Please keep the thermal gradient less than 100°C/ inch to avoid cracking. Please separate parts from the inside surface of the tube to avoid thermal shock. Please handle the tube carefully. No warranty for the tube.
Application Notes	Replace tube for MTI multi-zone tube furnaces of SWGL-1700Z2 Dual Zone, SWGL-1600Z2 Dual Zone, and SWGL-1600Y Three Zone Please click here to learn how to use and maintain an Alumina tube in an MT temperature tube furnace. In order to get longer tube service life, Please use quartz or alumina crucible to carry the sample, instead of loading sample directly inside the tube, please click the picture below to choose one crucible boat: