MTI Corporation provides the high-purity quartz tubes as the replacement part for high-temperature tube furnaces in universities, companies, and national labs. It can be used at operating temperatures up to 1200ºC.Purchase Notes: Please make sure the specification of the tube meets your needs before making a purchase. Since Nov 10, 2016, we no longer accept the return delivery of any tubes due to the fragile nature of the materials. All tubes are not refundable, exchangeable, or covered under the warranty (Consumables). We apologize for the inconvenience. Please check the package for damage before accepting the delivery. For more information or damage upon arrival, please contact us.SPECIFICATIONS O.D 101mm ±1.0mm (3.98") I.D 94mm ±1.0mm (3.62") Tube Length 1000mm (40") Max. Operating Temperature 1200ºC Application Notes Vacuum pressures may only be safely used up to 1000°C The flow rate for gases should be limited to