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High Pressure Tube Furnace with Optional Alloy Tube (900C or 1100C max heat temp.) - OTF-1200X-HPV

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2-4 weeks to delivery for QC

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UL/CSA/CE Certifications:
Process Vessel:


OTF-1200X series high-pressure split tube furnaces can be chosen from two kinds of alloy tubes, e.g. Stainless steel 310S refractory alloy or Ni-based superalloy, which offer a solution of heating treatment under high positive pressure with/without inert gas support to process special compound material. The furnace can be heated up to the max. 900°C or 1100°C with the optional vessel. The operating positive pressure is from 105 to 800 psi according to different heating temperatures.
  • Heating temperature up to max. 900°C or 1100°C, Depends on tube alloy
  • Stainless steel or nickel-base superalloy processing tube is included ( please choose from product optional )
  • Max pressure up to 800 PSI.depended on tube alloy
  • Double-layer steel casing with air cooling to keep furnace surface temperature lower than 60°C. High purity fibrous alumina insulation for Max. energy saving
  • PID automatic control with 30 steps programmable. Automatic overtemperature and thermally broken protection
  • One set of high positive pressure flange 
  • The pressure sensor is installed in the flange. The pressure will be displayed in the pressure controller in the front panel of the furnace. The alarm system is built in the pressure controller which allows the user to set up the high and low limit point of pressure. When the measuring pressure exceeds the limit point, the alarm strobe and whistle will be activated for warning
  • The furnace is able to be controlled by a computer. And the software and USB cable are included

OTF-1200X-HVHP-80(60)-SS OTF-1200X-HVHP-60-GH
Process Vessels (Pls select the tube size in options bar)
SS310S Stainless Steel alloy
80mm O.D x 70(±2) mm I.D x 1000 mm L or 60mm O.D x 50(±2) x 1000 mm L

Ni-based superalloy  (Click to download the alloy datasheet
OD 60 x  ID 52 x  Length 1000 (mm) 
Copper gasket

For 80mm O.D tube:
99 O.D x 82 I.D x 2.2mm
For 60mm O.D tube:
82 O.D x 63.6 I.D x 2.2mm
For 60mm O.D tube:
82 O.D x 63.6 I.D x 2.2mm
Working Pressure vs. Working Temperature
  577 PSI max   at ≤500°C
  511 PSI max   at ≤600°C
  428 PSI max   at ≤700°C
  203 PSI max.  at ≤800°C
  116 PSI max   at ≤900°C
Attention: Never heat up above 900°
900°C max.for < 1hr  
580 PSI (4 Mpa)     max. at  ≤800°C
362 PSI (2.5 Mpa)   max. at  ≤900°C
174 PSI (1.2Mpa)    max. at ≤1000°C
116 PSI (0.8 Mpa)      max. at 1100°C
Attention: Never heat up above 1100°C
The furnace also can reach high vacuum up to 10-6 torr by turbopump.
Pressure Range
Max. Heating Temp. 900°C 1100°C
Working Gases
Inert gas & Hydrogen
The inert gas, hydrogen, and oxygen
Heating Temperature
1100°C max.for < 1hr  
800°C continuous
1100°C max.for < 1hr 
1000C for continuous
Heating Rate
≤30°C/min ≤20°C/min
Heating Element
Fe-Cr-Al Alloy doped by Mo Fe-Cr-Al Alloy doped by Mo
Heating Zone
Total length: 440mm Single zone
Constant temp. zone: 150mm ±1°C
Total length: 440mm Single zone
Constant temp. zone: 150mm ±1°C
Temperature Control 
PID control method with over-temp protection
Temperature stability: ±1°C
Demo video here)

PID control method with over-temp protection
Temperature stability: ±1°C
Demo video here)


Omega 3mm OD K Type with high-temperature tolerance (220°C) connector

Omega 3mm OD K Type with high-temperature tolerance (220°C) connector
Positive Pressure Sensor
Installed in the high-pressure flange Installed in the high-pressure flange
PC Control 

Pressure Alarm System
The upper limit and lower limit control method
Alarm strobe and warning whistle
The upper limit and lower limit control method
Alarm strobe and warning whistle
AC 220V 50/60Hz
AC 220V 50/60Hz
(20A breaker required)
(20A breaker required)

Application Notes
  • The heating temperature must be limited by a certain pressure level due to vessel material strength. Please refer to the specifications
  • The pressure increases while the temperature is rising during operation. So you need to calculate the pressure changing towards your target temperature and set a safe value of pressure during the process
  • The furnace uses a tube with conflate designed flanges.
  • Note: Please never use an ordinary SS tube to connect to gas-inlet for using > 5Mp pressure, which may cause the tube exploded.    
  • The safety pressure relief valve is available to be installed at the downstream side. Please click here for details. 
  • Small quartz or Alumina boat should be used to load the sample into the vessel. Please click the link below to order separately. Never place the sample directly onto the vessel without a crucible. Vessel service-life could be reduced significantly if you do so.
  • You may use gold or nickel foil to wrap the crucible boat to minimize the contamination to the pressure vessel.
  • Optional torque wrench is available here to avoid overtightening the flange bolts
  • To measure the electric properties of thermoelectric ceramics under high pressure & temperature conditions, please order alumina testing fixture and high-pressure electrical feedthrough (10Mpa Max.) with the furnace (additional fee will apply).

Safety Note
  • Ni-based Superalloy ( Waspaloy or equivalent) is a reliable processing tube which can be used under high temperature and high pressure. It has excellent ductility and tensile property so only creep deformation happens under overpressure destruction test and following by a crack formed (usually at the hot zone at the center of the tube) to release the pressure. Brittle fracture won’t happen in the overpressure destruction test which means no tube explosion will happen under the overpressure of inert gas or safe gas or under other accidents causing overpressure of inert gas or safe gas.
            The pics show Ni-based Superalloy tube under overpressure test
  • Attention:  For the use with flammable, toxic or corrosive gas, you must contact MTI engineering group for the consultation to know all the prerequisites and precautionary measures.
  • Attention A two-stage pressure regulator must be installed on the gas cylinder to limit the pressure to below 3 PSI for safe operation. Please click here to learn how to install the gas regulator.
  • Do not over tightening the flange screws as this may cause permanent damages to the flange or screws. Please refer to the instructions about proper torque for installing CF flange bolts. We recommend you use a torque wrench to tighten the screws with the flange.
Operation Instructions                                       
Warranty One-year limited manufacturer warranty with lifetime support (Consumable parts such as processing tubes, o-rings, and halogen lamps are not covered by the warranty, please order replacements at related products below).

OTF-1200X-HVHP-60 OTF-1200X-HVHP-80 OTF1200X-60UV

Tube Furnace main machine

Processing vessel
SS310S alloy - 60
SS310S alloy  - 80
Ni-based alloy-60

High-pressure flange set (1 pair)
ORing-Cu82 Oxygen-free copper gasket
MTS02 USB cable and software for temp management
FLG-kit-2 Furnace hook

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