Alumina Ceramic Tubes

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Alumina Tubes

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 ceramic tubes come in custom sizes, including American and Metric, and offer a low material cost.

Minerals containing alumina used in alumina tubes 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 furnace tube models come with elevated dielectric properties and offer a higher vacuum or protective atmosphere at an extreme temperature.

Features of Alumina Ceramic Tubes for High-Temperature

  • Extreme high-temperature stability under reducing, inert, and high-vacuum conditions under high temperatures 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.
  • Sentro Tech also offers a volume discount for all listed sizes if the order quantity is more than 5 pieces for the same size.
  • Low material cost and custom size available.
  • Most items are in stock and can be delivered in 1-3 days.
  • 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).

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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°C 1600°C
Thermal Conductivity 24°C 230 200
BTU-in/ft2-hr-oF) 800°C 60 50
Dielectric Strength 24°C V/Mil 300 270
Thermal Expansion (per °C x 10-6) 8 8.4
(24°C-1000 °C)    
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

  Outside Dia. Inside Dia.
Part # inch mm inch mm
STT-0187 1/4 6.35 0.187 4.75
STT-0196 0.276 7.00 0.196 5.00
STT-0250 3/8 9.53 1/4 6.35
STT-0316 7/16 11.13 0.316 7.94
STT-0375 1/2 12.70 3/8 9.53
STT-0437 11/16 17.46 0.437 11.11
STT-0500 3/4 19.05 1/2 12.70
STT-0563 3/4 19.05 0.563 14.29
STT-0625 7/8 22.23 0.625 15.87
STT-0750 1 25.40 3/4 19.05
STT-0875 1 1/8 28.58 7/8 22.23
STT-1000 1.25 31.75 1 25.40
STT-1125 1 3/8 34.92 1 1/8 28.57
STT-1250 1 1/2 38.10 1 1/4 31.75
STT-1375 1 5/8 41.27 1 3/8 34.93
STT-1500 1 3/4 44.45 1 1/2 38.10
STT-1625 1 7/8 47.63 1 5/8 41.27
STT-1750 2 50.80 1 3/4 44.45
STT-1875 2 1/8 53.96 1 7/8 47.63
STT-2000 2 1/4 57.15 2 50.80
STT-2125 2 3/8 60.33 2 1/8 53.97
STT-2250 2 1/2 63.50 2 1/4 57.15
STT-2500 2 3/4 69.85 2 1/2 63.50
STT-2750 3 76.20 2 3/4 69.85
STT-2875 3 1/4 82.55 2 7/8 73.03
STT-3000 3 1/4 82.55 3 76.20
STT-3125 3 1/2 88.90 3 1/8 79.37
STT-3250 3 1/2 88.90 3 1/4 82.55
STT-3375 3 3/4 95.25 3 3/8 85.70
STT-3500 3 3/4 95.25 3 1/2 88.90
STT-3625 4 101.60 3 5/8 92.07
STT-4000 4 2/5 112.00 4 101.60
STT-4500 5 2/5 125.00 4 1/2 114.30
STT-5000 5 1/2 138.00 5 127.00
BBB Accredited Business Made in USA: American Product

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