It is a GE214 grade quartz tube that can reach 1150oC under high vacuum  and 1250ºC  Max. with flowing gas

Purchase Notes: Please make sure the specification of the tube meets your need before making a purchase. Since Nov 10, 2016, we 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 damage upon arrival please contact us.

SPECIFICATIONS

O.D	279mm ±0.5mm (10.98")
I.D	269mm ±0.5mm (10.59")
Tube Length	1020mm (40")
Max. Operating Temperature	1150ºC under vacuum and flowing gas 1200ºC with flow gas
Application Notes	In order to get longer tube service life, Please use quartz or alumina crucible to carry the sample, instead of loading the sample directly inside the tube, please click the picture below to choose one crucible boat:

Inspect your delivery:
Please check package for damages before accepting delivery.
Should damages found, please keep all packaging materials, take pictures, and report immediately to carrier/MTI.