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Vacuum Sealing Flange with Quartz Observation Window 80mm -EQ-FL-80W

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This is a smart sealing assembly w/ quartz observation window. Users can check the inside of a reaction chamber without interrupting the process. The flange has three sizes which fit 80mm O.D processing tube. Check in the option bar.


Package included One flange with gauge and valve, one steel sealing rings, two high-temperature silicone O-rings  ( 300oC Max.), and three screws, as well as the observation window.
  • Made of 304 Stainless Steel with double high-temperature silicon O-rings on each flange.
  • 30 mm dia UV grade quartz view window is installed on the center of the flange.
  • Dial Vacuum gauge and valve are installed on the side of the flange.
  • 1/4" hose Nipple is connected to valve.
  • Excellent for any type of tubing: ceramic, glass, quartz and steel pipe.
  • The assembly kit will seal 80-82 mm diameter alumina and quartz tube.
Installation Video
  • Refractory tube block must be placed in front of the flange (see picture below) to avoid heat radiation melting the  silicone O-ring. Customers may order a ceramic block from related products below.
  • Water cooling flange with view window is available upon request.
  • Two flanges with view window are needed for viewing through the tube.
  • Please do not over tighten the three hex screws on the flanges to avoid overpressure incidents. The recommended torque is 35~40 inch-lbs.
  • For liability considerations, MTI does not recommend or endorse the use of any toxic, flammable or corrosive gases with our flange assemblies. Please contact us with any concerns.

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