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Three Heating Zone High Pressure and High Vacuum Tube Furnace with Super-Alloy Tube upto 1100°C - OTF-1200X-HP-III-80

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Item Number: OTF-1200X-HP-III-80
4 -6 weeks to delivery for QC


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OTF-1200X-HP-III-80 is a high pressure / high vacuum split tube furnace with three heating zones. The processing tube is made of a Ni-based superalloy, which offers a solution for heat treatment under both high positive pressure and high vacuum pressure with/without inert gas support to process special compound materials. The furnace can be heated up to a max. 1100°C at 2.5 bar pressure (or 900°C at 80 bars). The gas flowing system is variable upon request.


Working Pressure
  • 200  bar Max. at   650 °C
  • 140  bar Max. at   800 °C
  •   80  bar Max. at   900 °C
  •   50bar Max. at 1000 °C
  •  2.5  bar Max. at 1100 °C
  • Never heat up above 1200°C
  • This furnac also can achieve high vacuum upto 10-6 torr by turbo pump

Working Gases
  • Inert gas or oxygen
  • No hydrogen or any flammable gas is allowed

Heating Temperature
  • 1100 °C max.for < 1 hour 
  • ≤ 1000 °C continuous
Heating Rate
  •   0   –  200 °C:    ≤ 10  °C/min
  • 200  –  700 °C:    ≤  6  °C/min
  • 700  –  900 °C:    ≤  3  °C/min
  • 900  – 1100 °C:    ≤  1  °C/min
Cooling Rate
  • 1100 – 800  °C:    ≤  5  °C/min
  •  800 – 200  °C:     ≤ 10 °C/min
  •  200 –     0  °C:    free cooling

Heating Zone

  • Three heating zones:  150 mm + 150 mm + 150 mm
  • Total heating zone length: 450 mm 
  • Constant temp. zone: 280 mm ±1°C
Temperature Gradient

  • The furnace is able to achieve a temperature gradient up to 19 °C/inch (150 °C / 200 mm), if
    • Center zone is heated up to 1000 °C
    • Left and right zones remain idle
Heating Element
  • Fe-Cr-Al Alloy doped by Mo
  • Three Omega K-type thermocouples (OD 3 mm) in the furnace

Temperature Control

  • Three precision digital temperature controller with 30 programmable segments and +/- 1 ºC accuracy
  • Safety protection of over-temperature and broken thermocouples are integrated
  • PC control software is available at extra cost

Process Vessel   
  • Made of Nickel based superalloy GH747(Click to download GH747 nickel based alloy datasheet)
  • Size: 85 mm OD x 50 mm ID x 1000 mm L
  • Working gasses: O2 and inert gasses such as N2, Ar, and He
  • A small quartz or alumina boat should be used to load the sample inside the tube. Never place the sample directly onto the tube without a crucible, which may greatly shorten the processing tube service-life
  • Warning: Never put sample inside tube directly without crucible or isolated foil to avoid sample react with tube alloy.
  • You may use gold or nickel foil to wrap the crucible boat to minimize the contamination to the pressure vessel.
  • Attention: Processing tube is a consumable part. Please click the photo below to order replacement or a spare one    
Pressure Sensor and Valve

  • Pressure gauge with measurement range of 0 – 25 MPa and over-pressure alarm is installed (downstream side)
  • Pressure control valve with working range of 0.2 – 15 MPa is installed (upstream side with 1/4" BSPP venting port)
  • If the measured pressure reaches the high-pressure alarm value, the pressure control valve will be opened until the pressure drops 0.2 MPa (2 bars) below the alarm value
  • Manual pressure relief valve is installed for manual pressure control and relief (downstream side with 1/4" BSPP gas outlet port)
High-pressure relief valve
  • Safety pressure relief valve is recommended  (upstream side with 1/4" NPT venting port)
  • Please info us your application temperature and we will pre-set the release pressure for you.  For example, you need to heat to 800C, the Max working pressure should be 140 bars, we will pre-set the relief valve to 140 bars. 

Flange and Fitting
  • A pair of 63 mm CF type flanges is included. Please use a torque wrench (optional, not included) to avoid over tightening the flange bolts.
  • 2 pieces of copper O-rings (99 mm OD x 82 mm ID x 2.2 mm thickness) are included. Please order extra copper O-ring as consumable parts
  • A pair of cooling fans is included for air cooling the flanges
  • One mobile cart with installation holes is included for easy setup and immediate use

Optional Parts
(with extra cost)

  • Please order heavy duty rotary vane vacuum pump (7.8 CFM, 240 L/min) – EQ-YTP-50 for low vacuum operation (Photo #1)
  • If high vacuum operation is needed, please consider the turbomolecular vacuum pump station (up to 1E-7 mbar) – EQ-PV-HVS2 (Photo #2)
  • Gas flow control system is available upon request (Photo #3)
  • Please use torque wrench (optional, not included) to avoid over tightening the flange bolts (Photo #4)
                1                              2                                 3                                                4                                          
  • To measure the electric properties of thermoelectric ceramics under high pressure & high temperature conditions, please order alumina testing fixture and high-pressure electrical feedthrough (10 MPa max) with the furnace at extra cost (Photo #5 & #6)
                          5                            6
  • AC 208 - 240V 50/60Hz
  • 4.2 KW (32 A breaker required)
Operation Instruction         

Application Notes
  • Hytort Application, or named Hydroretorting of Shale Oil is a process developed by IGT to double the yield of shale oil and hydrocarbon gasses. Please click underlined to view research paper.
  • The gas pressure will increase during the heating operation. Please calculate the pressure changing towards your target temperature and set a safe value of pressure during the process.
Safety Notes

  • Ni-based superalloy (Waspaloy or equivalent) is a reliable material which can be used under high temperature and high pressure. It has excellent ductility and tensile properties. Only creep deformation happens under overpressure, and cracks are usually formed at the center of the tube to release the pressure. Brittle fracture and tube explosion will not happen. Left pics shows Ni-based Superalloy processing tube under overpressure test
  • DO NOT over tighten the flange screws as this may cause permanent damage to the flange or screws. Please refer to the instruction about proper torque for installing CF flange bolts. We recommend you to use a torque wrench to tighten the screws with the flange
  • DO NOT operate the furnace at a temperature/pressure above the safety limit that MTI recommends
  • Extreme caution should be exercised while operating within the vicinity of the high-pressure furnace. The operator should NEVER stand in front of the flanges, gas inlet/outlet, or the pressure relief valve while the tube is pressure loaded! NEVER face on the gas inlet/outlet and the pressure relief valve to avoid injury from high pressure, hot gas discharge
  • Attention: A two-stage pressure regulator must be installed on the gas cylinder to limit the pressure for safe operation. Please click here to learn how to install the gas regulator.
  • For the use with flammable, toxic or corrosive gasses, you must contact MTI engineering group for the consultation to know all the prerequisites and precautionary measures

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