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1500C Max Tube Furnace (50mm OD) with Sliding Flanges for Fast Heating/Cooling - GSL-1500X-RTP50

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GSL-1500X-50RTP is a slideable tube furnace that utilizes 50 mm OD x 44mm ID x 304.8 mm (12") L  mullite or quartz tubes (one end closed). The maximum working temperature of this furnace is 1500ºC.  A sliding rail is installed on the right side of the flange for manually moving it from one side to the other, which allows it to achieve fast heating and cooling up to 1500°C.  For the fastest heating, you can insert a mullite processing tube into the pre-heated furnace at the desired temperature. For fast cooling, you can remove the tube from the hot furnace chamber and use forced air cooling. The heating and cooling rates can be much higher under vacuum or inert gasses. It is an ideal furnace for rapid thermal processing at the lowest cost.


Furnace Structure
  • One sliding flange is installed on the right side furnace, which can move the processing tubes in & out easily
  • Vacuum flanges can reach 10E-5 torr by molecular pump or 10E-3 torr by a mechanical pump. The flange has a 1/4" Dia. the thermal couple built-in for monitoring real-time temperature inside the tube
  • RS485 port included for computerized control
2.5KW (20A breaker required)
Voltage AC 208-240V Single Phase, 50/60 Hz
Max. Temperature 1500°C
Continuous Temp. 1400°C (for mullet tube only)
Temp. Accuracy +/ - 1°C
Heating Zone Length  6" (152 mm)
Constant Temp. Zone 100 mm (+/-1°C) @ 800 - 1500°C
Quartz Tube Block
Specially designed quartz tube block with feedthrough holes.
Heating Elements SiC rod (1500C grade) , 4 pcs
Thermocouples Two S type thermal couples are included. One T/C  is installed in the furnace to control furnace temperature (below left), and another S type T/C  inserted inside the tube to monitor sample real temperature profile (below right)
 (Click pic for replacing part)      (Click pic for replacing part)
Temp. Controllers
  • Two digital temperature controllers with 30 programmable segments are built-in. One control furnace temperature and another monitor temperature of the sample inside the processing tube.
  • Built-in over-temperature alarm and protection allow for operation without an attendant.
  • +/- 1ºC temperature accuracy.
Heating & Cooling Rate Temp vs Time curve
(Mullite tube)

Temp Vs Time curve
(Quartz tube)
For Mullite Tube:
 Heating speed:
 10°C/sec (RT - 800°C);
 7°C/sec (800°C - 1000°C);
 4°C/sec (1000°C - 1100°C);
 3°C/sec (1100°C - 1200°C);
 1.5°C/sec (1200°C - 1300°C);
 0.7°C/sec (1300°C - 1350°C)
Cooling speed:
  14°C/sec    (1350°C - 1000°C);
  7°C/sec      (1000°C - 800°C);
  5°C/sec      (800°C - 600°C);
  3.76°C/sec (600°C - 500°C);
  2.5°C/sec   (500°C - 400°C);
  1.36°C/sec  (400°C - 300°C) 
For Quartz Tube:
Heating speed:
30°C/sec (RT - 500°C);
12°C/sec (500°C - 800°C);
5°C/sec (800°C - 900°C);
3.6°C/sec (900°C - 1000°C);
1°C/sec (1000°C - 1100°C);
Cooling speed:
16°C/sec (1100°C - 800°C);
9°C/sec (800°C - 600°C);
5°C/sec (600°C - 500°C);
3.6°C/sec (500°C - 400°C);
2.5°C/sec (400°C - 300°C);
Processing Tube Size (one mullite tube and one quartz tube are included in the standard package)
One end closed  mullite tube made in the USA
Size: 50mm OD x 44mm ID x 304.8mm L
Max. Working Temp:
1500°C in air (<1 hr),1300°C in vacuum
One end closed quartz tube
Size: 50mm OD x 44mm ID x 304.8mm L
Max. Working Temp:
1200°C in air (< 1hr), 1000°C in vacuum
Optional:CF Type Quartz Tube
with flange  for Ultra-hi-vacuum 10-6 torr, 1000°C Max
Warning: The processing tube is consumable and easy to broken during RTP, not covered by warranty.  Pls click pic above to order spare
Sliding Flange
  • Double sliding rail made by Cr-plated steel
  • Sliding length: 350 mm
Vacuum Seal  & Digital Vacuum Gauge
  • One stainless steel flanges with 1/4"Dia fitting for insect thermal couple is included
  • One digital vacuum gauge and valves are included for immediate use.
  • OPTIONAL: A gas-type independent (above 10 mbar) digital vacuum gauge with a wide range between 3.8x10-5 to 1125 Torr. Aside from greater measurement precision, this gauge reduces the risks of chamber explosions caused by the incorrect reading of gas pressures due to gas-type dependency
Vacuum Level 
  • Limited by the pump. (pump is not included)
    • 10E-5 torr can be reached by molecular pump
    • 10E-2 torr by a mechanical pump
Dimensions 400 L  x 305 W x 530 H, mm (15.7" x 12" x 21")
Net Weight ~ 45 Kg
Shipping Package Size 47" x 31" x 40"
Shipping Weight 150 lbs
Laptop, software & WiFi Control (Optional)
  • Brand new laptop with Microsoft Windows 10 and Microsoft Office 2013 (30 days free trial) for immediate use.
  • Labview Based Temperature Control System (EQ-MTS01) enables the user to edit temperature profiles, manage heat-treatment recipes, record and plot data for MTI furnaces.
  • A wireless remote control provides up to 300 meters of operating range.
  • The above features are available upon request at an extra cost (up to $1,000). Please contact us for more information.
  • One-year limited manufacturer's warranty with lifetime support (Consumable parts such as furnace liner, processing tubes, heating elements, and O-rings are not covered by the warranty, please order replacements at related products below.)
  • CE Certified
  • NRTL or CSA Certification is available upon request at the extra cost
Click here to learn more about the installation of a gas regulator.
  • To get the fast heating performance, first, keep the tube out of the chamber, meanwhile preheat the chamber to the required temperature. Then insert the tube into the chamber to get fast heat. Please watch the demo video below to see how 
  • The tube furnaces with processing tubes are designed for use under vacuum and low pressure < 0.02 MP.  Vacuum pressures may only be safely used up to 1300°C for all mullite tube furnaces
  • Attention: A two-stage pressure regulator must be installed on the gas cylinder to limit the pressure to below 3 PSI for safe operation. Click here to learn the installation of a gas regulator.  
  • Never heat the furnace while the gas release valve is closed and a positive pressure condition exists within the furnace chamber. The pressure gauge must be used to closely monitor the chamber condition at all times during the heating process; please open the gas release valve immediately once the chamber pressure has reached over 3 PSI to prevent unforeseeable damages.
  • NOTE The mullite tube is a consumable part. The tube is not covered by the Warranty. Use the link to order more. 
  • Please wear protective gear, such as heat resistant suit & gloves, if you intend to retract the tube from the heating chamber. DO NOT TOUCH THE TUBE SURFACE WHEN IT IS HOT!
Demo Video                 
Application Note This furnace can be used for preparing LPS solid-state electrolyte powder using enhanced air cooling ( or spray Liquid N2 gas to fast cooling 

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