Alumina Tubes for High-Temperature Furnaces

Three alumina ceramic tubes by Sentro Tech

Get Elevated Temperature Stability with Alumina Ceramic Tubes

Sentro Tech’s alumina tubes, with 99.5% to 99.8% high-purity, offer elevated temperature stability. Alumina tubes come in custom sizes, including American and Metric, and offer a low material cost.

Minerals containing alumina make up nearly 15% of the earth’s crust making it practically inexhaustible and versatile. Alumina combines low thermal expansion, superior thermal conductivity, and high-compressive strength to make these furnace tubes thermal-shock resistant. Sentro Tech alumina tube models come with elevated dielectric properties and offer a higher vacuum or protective atmosphere at an extreme temperature.

Benefits of Alumina Tubing

Our alumina tubes offer:

  • Extreme high temperature stability under reducing, inert, and high-vacuum condition under high temperature up to 1800°C.
  • Extreme wear and abrasion resistance.
  • Chemical corrosion resistance under high temperature.
  • High dielectric properties.
  • Protective atmospheres or high vacuum at high-temperature to eliminate contamination or impurity.
  • Low material cost and custom size available.
  • Available Tube Diameter From 3/16″ to 9″ for American size and 2 mm to 150 mm.
  • Available Tube Length: From 1″ ( 25mm) To 72″ ( 1828mm).
  • Most items are in Stock and can be delivered in 1-3 days.
  • Sentro Tech also offer volume discount for all listed sizes if order quantity is more than 5 pieces for same size.

A 20-year lab furnace industry leader, Sentro Tech guarantees our materials to be the best for your particular applications. Contact us for a quote on alumina tubing for your high temperature furnace today!

Request a Quote on Alumina Furnace Tubing

 

Physical Properties of Alumina Tubes

MATERIAL ALUMINA  
Composition 99.80% AL2O3 99.5% AL2O3
Bulk Specific Gravity (g/cc) 3.9 3.8
Color Ivory Ivory
Impenetrability Gas Tight Gas Tight
Dye Penetration A.S.T.M. Tight Tight
Flexural Strength (psi) 70,000 50,000
Compressive Strength (psi) 370,000 350,000
Tensile Strength (psi) 43,000 33,000
Maximum Working Temperature 1800°C 1750°C
Likely Sag Temp. Unsupported Tube* 1600 oC 1600 oC
Thermal Conductivity 24oC 230 200
(BTU-in/ft2-hr-oF) 800oC 60 50
Dielectric Strength 24oC V/Mil 300 270
Thermal Expansion (per oC x 10-6) 8 8.4
(24oC-1000 oC)    
Hardness (Moh’s scale) 9 9
* Temperature at which an empty tube, 1 1/4″ diameter, suspended across an 18″ span, will sag 1/4″ in 1 hour.
Where sag is not acceptable, tubes must be adequately supported along the full length.

Standard Alumina Tube Dimensions

Dimension measurements of standard Sentro Tech alumina furnace tubes