Ceramic tubes e.g. alumina furnace tubes

Ceramic tubes and alumina furnace tubesWe hold extensive stocks of ceramic tubes for a variety of applications including furnace tubes in a variety of materials: mullite; corundum; alumina; sillimanite; mullite-bonded silicon carbide; recrystallised silicon carbide; Zirconia. Other materials are available on request.

Ceramic tubes are extensively used in furnace and kiln applications although there are many other applications were they are commonly found. The furnace tube is heated from the outside and the interior of the ceramic tube provides the work environment.

Where there is internal pressure or atmosphere in the furnace then dense products are required such as high Alumina tubes or Mullite tubes.   Dense Alumina or Mullite furnace tubes are a little more prone to thermal shock than porous versions, so heating rates need to be carefully controlled to prevent cracking.

Our ceramic tubes are extensively used as furnace tubes in extreme working environments for principle laboratory/analysis furnaces such as Carbolite, Leco and Lindberg. The furnace tubes are normally supplied as dense mullite (EM60) or alumina (EA998) for these applications.

Porous ceramic tubes are also used to support wound elements for heating larger furnaces and Kilns. Ceramic tubes are also used to provide lead outs for electrical cables, temperature measurement or as burner holes in Gas and oil fired Kilns.     We also supply custom ceramic burner components in Alumina or Silicon carbide.

We have complete in-house capabilities to supply custom-design tubes and rods with special dimensions & tolerances on request. We are able to produce extremely tight toleranced tubes through our specialized manufacturing techniques. Adding flanges, drilling holes and cutting slots in all our standard materials is also available.

Lead through ceramic tubes

Lead through tubes are typically a tube with a flange at one end. These are often used to provide a passage through the wall of a furnace to allow burners or thermocouples to be passed through.

These tubes are made to order due to the large amount of variation in the requirement. We are able to offer most common tube sizes with a flange added.

Standard furnace tubes

Standard furnace tubes are round but other shapes can be manufactured. We have supplied grooved outer diameter tubes, oval, square, rectangular and hexagonal shapes.

Multi bore ceramic tubes are also available.

Available in diameters from 0.03" (0.7mm) – 21.6" (550mm)
Available in length from 0.01"(0.25mm) – 10ft (3050mm)

  • Comprehensive range of sizes
  • Available directly from stock
  • Competitive prices
  • Custom shapes & dimensions
  • Flanges, drilled holes, slots

Standard materials

99.7-99.8% alumina (ea998), 99.5% alumina (ea995), mullite (em60), porous mullite (em 60p), corundum (em80p)

See materials menu above for detail

Applications for ceramic tubes

  • Furnace work tubes
  • Heating element supports
  • Temperature measurement
  • Kiln furniture
  • Vacuum furnace parts
  • Electrical insulators
  • Lead through tubes


  • High dimensional tolerances
  • Chemical corrosion resistance
  • High temperature resistance
  • Very good thermal shock properties

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