4" OD larger diameter Alumina tube with high purity 95% Al₂O₃ material. It 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.
Purchase Notes: Please make sure the specification of the tube meets your need before making a purchase. Since Nov 10, 2016, we have no longer accept return delivery of any tubes due to the fragile nature of the materials. All tubes are not refundable, not exchangeable, nor covered under the warranty (Consumables). We apologize for the inconvenience. Please check the package for damages before accepting the delivery. For more information or damaged upon arrival please contact us.

SPECIFICATIONS

Purity	Al2O3 > 95%, SiO2 < 0.25%, CaO+MgO < 0.3%
Density	> 3.8 g /cm3
I.D	3.625+/-0.08" (90+/-2mm)
O.D	4+/-0.04" (101.7 +/-2mm) Note: The outer diameter of the center of the tube is slightly longer.
Length	40 " (1000 mm)
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	Please click here to learn how to use and maintain an Alumina tube in MTI high-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: