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How To Choose A Tube Furnace

  1. Know your application

    • Single Zone vs Multi-Zone: Multi-zone furnaces have multiple independently-controlled, constant-temperature zones, which allows controlled temperature gradient or a longer heating zone

    • Horizontal (standard) vs Vertical: Vertical tube furnace provides smaller footprint and can be used for fast heating / quenching process

    • High Pressure / Vacuum Furnace: Special designed furnace with stainless steel or superalloy-based tube for high pressure / vacuum processing at high temperature

    • Rotary Tube Furnace: Tube is rotated during heating for better powder processing / coating uniformity

    • Multi-Function: Tube furnace based complete systems, such as CVD, PECVD, HPCVD, ALD, Graphene & 2D material growth system, are available

  2. Certifications for tube furnace

    • All MTI's furnaces are assembled and quality controlled in USA and CE certified

    • As for UL / CSA certification, please check link 1 for tube furnace models that have already been certified, and link 2 for models that are ready to pass the inspection at extra cost

  3. Choose working temperature

    • Please note there are maximum temperature (can be maintained < 1 hr) and continuous working temperature (safe, continuous use temperature)

    • The maximum working temperature depends on the heating element used, and can be divided into four categories:

      a.   250 ~ 1250 °C       Fe-Cr-Al or Ni-Cr-Al alloy heating element        K type thermocouple
      b. 1300 ~ 1600 °C       SiC heating element                                       S type thermocouple
      c. 1600 ~ 1800 °C       MoSi2 heating element                                   B type thermocouple
      d. 1800 ~ 2000 °C       Graphite or W heating element                        C type thermocouple
    • Select the processing tube corresponding to the furnace max temperature:

      a. Quartz tube:            ≤ 1200 °C in 1 atm; ≤ 1000 °C under vacuum
      b. Mullite tube:            ≤ 1500 °C in 1 atm; ≤ 1300 °C under vacuum
      c. Alumina tube:          ≤ 1800 °C in 1 atm; ≤ 1500 °C under vacuum
      d. SS310 tube:            ≤ 1000 °C in 1 atm; ≤ 800 °C under vacuum. (For high pressure / vacuum furnace)
      e. Superalloy tube:       ≤ 1000 °C in 1 atm; ≤ 900 °C under vacuum. (For high pressure / vacuum furnace)
  4. Choose heating zone length based on your sample

    • Please note there are total heating zone length (length covered by heating element) and constant temperature zone length (center zone with less than +/- 1 °C variation). Constant temperature zone is always shorter than the total heating zone. Please choose a furnace with a constant temperature zone longer than your sample for uniform heating

  5. Choose the tube size (inner diameter) and crucible size based on your sample

    • Please choose the corresponding tube size and crucible size based on the sample volume

  6. Choose input voltage

    • Choose between 110 VAC and 220 VAC depending on the country or region

  7. Choose a vacuum pump

  8. Customize your furnace by choosing from various furnace accessories provided by MTI

    • Corrosive gas accessory

  9. If you have any question on configuring your tube furnace, please contact MTI technical support to discuss your application needs

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Notices
1. Prices listed online are valid for US market and whom pay by credit card only. There will be extra charges for shipping & handling. Price various from country to country.
2. We may add extra charges for paper order and net30 terms due to extra labor cost.
3. The prices listed are subject to change without notice.