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Vertical High Temperature Vacuum and Atmosphere Tube Furnace (1700 C, 96mmID) - GSL-1700X-100VT-UL

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Item Number: GSL-1700X-100VT-UL
Transported by LTL Freight (Truck)


GSL-1700X-100VT-UL is UL/CSA ready to pass furnace. This high temperature vertical tube furnace is using MoSi2 as heating elements and 4" diameter high purity alumina tube. It is designed for heat treatment of all types of new materials under vacuum or other gases condition up to 1700oC. The temperature of GSL-1700X-100VT  tubing furnace is controlled by high precision SCR power controller with accuracy +/-1 oC and 30 segments programmable up to 1700oC (3092 oF).



Furnace Structure

  • Double layer steel casing.
  • High purity 1800oC grade fibrous alumina insulation
  • Alumina processing tube, vacuum & gas sealing flange with valves, vacuum gauge, thermal blocks are included for immediate use

Power Consumption

Max. 4 KW

Input Voltage

Single Phase, 220V AC,  50/60 Hz

Normal Working Temperature:

800 -1650 oC (3002  oF)

Max. Working Temperature:

  1700 oC (3092  oF) for < 1 hours

Max. Heating / Cooling Rate: 

  5 oC / min above 1200 oC and 10 oC/min below 1200oC

Heating Zone


Constant Temperature Zone 

  75 mm  (3")  Temperature Accuracy:   +/- 1 oC

Heating Elements

  4 pcs of U-shaped 1800 grade MoSi2

Temperature Controller

  • PID automatic control via SCR (Silicon Controlled Rectifier) power control with phase angle fired, current limiting resistor.
  • 30 programmable segments for precise control of heating rate, cooling rate and dwell time.
  • Please click here to learn why SCR is more accurate than SSC (Solid state relay).
  • Built-in over temperature alarm and protection allows for operation without attendant.
  • +/- 1 ºC temperature accuracy.
  • RS485 Communication Port
  • Optional:  
    • The furnace may be operated by PC by installing a control module. Please order a MTS-02 control module at extra cost. 
    • If you order the PC control module together with the furnace, we will install and test it before shipping. We recommend you to order a computer (laptop) from us to avoid software installation problems. For more information please click here.

Processing Tube

  • 99.8%High purity Al2O3 Ceramic, Made in USA (included)
  • ID: 96mm; OD: 102 mm x Length 1000 mm
  • Two fiberous ceramic tube blocks are included for blocking heat radiation from inside tube. (Ceramic blocks must be fully inserted into the furnace chamber before heating)


Vacuum Sealing Flanges

  • One pair sealing flange with double silicone high temperature O-ring  is included.
  • Two SS needle valves and one dial vacuum gauge are installed with flange for immediate use.
  • Vacuum pressure can reach 50 mTorr by quality mechanical vacuum pump and 10^-5 torr by turbo molecular pump. Please click picture below to see flange assembling details.
Fitting Ports


Vacuum Level

Limited by vacuum pump

  • 50 mtorr can be achieved by mechanical pump
  • 10^-5 torr can be reached by molecular pump

 Vacuum pump is not included, please order separately by clicking here


Overall:  550 L x 550 W x 1250 H mm.

Net Weight

150 kg (330 lbs) 

Shipping Dimensions

48" x 40" x 67"

Shipping Weight

200 kg (440 lbs)


One year limited warranty (Consumable parts such as processing tubes, O-rings and heating elements are not covered by the warranty, please order the replacement at related products below.)


  • CE Certified for the whole furnace
  • All electric components ( >24V) are UL or equivalent Certified and ready to pass TUV, ETL, UL, CSA test
  • UL/CSA Certificate is available upon request, additional charges will apply. (please click mark below to learn)



MoSi2 heating element is used in high temperature under an oxidizing atmosphere. During the oxidizing process, the SiO2 protective film is formed again the heating element from melting during sustained use. The MoSi2 heating element must not be used in the temperature between 400 oC and 700 oC for a long time, otherwise the element will be cremated under the strong oxidizing atmosphere at low temperatures.

Application Notes

Operation Instructions

Part No.
 Click pic to order extra
4 pcs of MoSi2 Heating Elements
Vacuum Gauge and Connecting Flanges with 1/4" hose fitting.  4 pcs of High Temperature Vacuum Gaskets are included
1 sets
Pt-Rh to Pt-Rh Thermal Couples  ( B Type ) with alumina protective tube
1 set
 Al2O3 Furnace Tube ,  ( made in USA )
1 pcs
 Foam Al2O3 Tube Block
4 pcs

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1. Prices listed online are valid for US market and who 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.