Is a Rotary Tube Furnace right for your process?

Is a Rotary Tube Furnace right for your process?


Rotary tube furnaces provide efficient heat and mass transfer and minimize material handling for applications such as powder processing. Deltech rotary tube furnaces are custom designed and built for your particular application requirements, so you can specify:

Maximum operating temperatures up to 1700 degrees Celsius

Workspace size

Residence time

Tube rotation rate

Tube inclination angle

Temperature profile

Atmosphere flow rate

Powder bed depth

Feed rate

Here is what you should know about choosing a tube for your rotary tube furnace:

Tube stresses include rotational speed, amount of material, diameter of the tube, suspended length, and tube thickness.

For tube diameters larger than 9”, alloy tubes are best but they are limited to temperatures under 1200 degrees Celsius.

Use ceramic tubes when metals in the alloy might react with a high purity product or off gas. These tubes are also needed for high temperature processing.

Lower grade silicon carbide tubes are porous, as are alumina oxide tubes. That makes them undesirable for most applications that require processing in a controlled atmosphere.

Quartz tubes are not permeable, but only suitable for processing under 1300 degrees Celsius.

You may not know that…

Rotary tube furnaces are unsuitable when long residence times – requiring a small angle of inclination and a slow tube rotation rate – are required. It is difficult to control residence time for more than two hours. Look to a lab scale or production size bottom load, front load, or top hat furnace if your product requires longer processing times. These furnaces are available with optional controlled atmosphere capability.


Deltech furnaces are resistance heated using wire wound, silicon carbide, or molydisilicide heating elements depending upon the maximum temperature requirement and other design considerations. Our control systems are certified by Intertek UL508A compliant. We are an ISO 9001:2015 certified company.


Contact us for more information or to start the design process. If you’re not sure what you need for your application, we can help.



Is a rotary tube furnace right for your process?


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