Browse Categories

Sealing Flange for 80mm dia. Quartz Tube with 1/4" Feed-through, Two Valves & KF-25 Vacuum Ports - EQ-FL-80KF25-FT

Sale Price: Starting at USD$489.80
If you are international, please click this.

Product Options

Select Gauge Type:

 This is a pair of smart sealing assembly for a vacuum tube furnace to seal both ends of OD 80-81 mm tube without any welding and gluing.

  • Left side flange has a barbed needle valve,1/4" feedthrough for thermocouple inserted  and 1/8 NPS valve  with installed  Mechanical Pressure Gauge.  (if you need  Compact Digital Vacuum Gauge , please choose from product option at extra cost . If you don't need vacuum gauge, please instruct us when you order, we can take it off, but no price deduction )  
  • Righ side flange has a KF25 port with barbed needle valve. You may need KFD25 angle valve before connecting the vacuum port to vacuum pump.  Please choose the KF25 angle valve at related product below.
  • Seal tube by tightening screws on the flange without any welding and glue.
  • 1/4" in diameter vacuum sealing assembly will connect with 1/4" rubber hose.
  • Designed for MTI OTF-1200X Desktop Quartz Tube Furnace.
  • Excellent for any type of tubing: ceramic, glass, quartz and steel pipe.
    Package included One Mechanical Pressure Gauge ( Optional: Digital Pressure Gauge), two flanges, two steel sealing rings, four high-temperature silicone O-rings  ( 300oC Max.), and six screws
    Vacuum Level 10E-5 torr by molecular pump and 10E-2 torr by mechanical pump
    Installation Video
    Dimensions        Click to enlarge

    • Must put a refractory tube block in front of flange (see picture below) to avoid heat radiation melt silicone O-ring. You order a ceramic block in related products.
    • 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.

    Related Products

    Shopping Cart
    Your cart is empty.
    Please clear the browsing history before ordering the product. Otherwise, availability and price are not guaranteed.
    Mailing Lists
    MTI sponsorships:
    MTI Sponsors Thermoelectrics Workshop

    MTI-UCSD Battery Fabrication Lab

    MTI Sponsors the Postdoctoral Awards

    Upcoming Shows:
    35th International Annual Battery Seminar & Exhibit Mar 26 - 29 Fort Lauderdale FL Booth 232

    2018 MRS Spring Meeting Exhibit April 2 - 6 Phoenix AZ Booth 607

    Ceramics Expo May 1 - 3 Cleveland OH Booth 646

    Recent Attended Shows:
    TMS 2018 1147th Annual Meeting Exhibition Mar 11 - 15 Phoenix AZ

    APS March Meeting 2018 Mar 5 - 9 Los Angeles CA

    2018 SME Annual Conference & Expo Feb 25 - 28 Minneapolis, MN

    Click here to see our past conferences


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