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One End Closed Quartz Tube ( 50 ODx44 IDx 263L, mm) w/ CF Flange for Ultra-Hi Vacuum <5x10E-6 torr - EQ-CFF-50

In stock
Item Number: FL50CF
The one end closed quartz tube with CF type flange is designed for Ultra-high vacuum application up to 10e-6 torr via turbopump.

Purchase Notes: Please make sure the specification of the tube meets your need before making a purchase. Since Nov 10, 2016, we no longer accept return delivery of any tubes due to the fragile nature of the materials. All tubes are not refundable, not exchangeable, nor covered under the warranty (Consumables). We apologize for the inconvenience. Please check the package for damages before accepting the delivery. For more information or damage upon arrival please contact us.


  • Made of SS 316 
  • CF type to fit the included quartz tube only
  • Fluoro-elastomer O-ring
  • There are two feedthrough connections, KF-16 and KF-40
KF-16 could be used on NIST Traceable Anti-Corrosive Digital Vacuum Gauge or another similarity, and KF - 40 could be used on any fit in with the feedthrough, such as bellow tube for vacuum pump.
Quartz Tube

  • OD:        50mm ±0.5mm (1.97")
  • ID:          44mm ±0.5mm (1.73")
  • Length:   263 mm      ( 10.3)
  • One end with the flat end
  • One end is closed as the picture left
  • Max. working temperature 1200C ( the quartz thermal radiation block must be used)

Vacuum & furnace optional
  • 7.4E-6 hPa (5.6E-6 torr), unloaded, room temperature
  • 4.6E-6 hPa (3.5E-6 torr) after bakeout
  • This tube and flange kit is designed for inserting MTI hybrid lab furnace as the picture # 1 below 
  • In order to achieve the ultra-high vacuum condition, It is recommended to use a quartz block which can ensure a clean environment with literally no degassing. Please click the image #3 below to order. 
       Pic.1         Pic.2        Pic.3
Application Notes

Ceramic Crucibles ( Alumina, Quartz and Zirconia etc )
  • Vacuum pressures may only be safely used up to 1000°C
  • Quartz tubes are designed for using under vacuum and Max.positive  pressure must be < 0.2 bars / 3 psi / 0.02 MPa
  • For using the tube flange kit at a high temperature >500C,  the quartz thermal radiation block shall be used.
  • In order get longer tube service life, Please use quartz or alumina crucible to carry the sample, instead of loading the sample directly inside the tube, please click the picture below to choose one crucible boat:

Inspect your delivery:
Please check package for damages before accepting delivery.
Should damages found, please keep all packaging materials, take pictures, and report immediately to carrier/MTI.

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1. Prices listed online are valid for the 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 costs.
3. The prices listed are subject to change without notice.