CF Vacuum Fittings

Con Flat Blank Flange

CF Flanges for High Vacuum and Ultra-High Vacuum (UHV)

CF flanges provide all metal sealing for vacuum chamber systems. CF (also known as ConFlat) flanges use an OFHC copper gasket and knife-edge flange and is a bolted flange. The knife edge of the flange presses into the softer copper gasket to make a high vacuum seal. CF or con-flat is perfect for high vacuum, ultra-high vacuum (UHV) and where high temperature in needed.  Deformation of the metal gasket fills small defects in the flange, allowing Conflat flanges operate down to 10−13 Torr (10−11 Pa) pressure. Bake-out of the flange can be up to 450 deg C.

The construction of CF Flanges can be specified with tapped or untapped holes. CF Flanges can be either rotatable or non-rotatable to allow for variations in vacuum systems. Untapped flanges can be connected to each other with stainless steel bolts and hex nuts or plate nuts.

Conflat Vacuum Fittings
Conflat Vacuum Cube Cross
Conflat cross for Ultra-High Vacuum or UHV

CF Vacuum Fittings

CF Vacuum Fittings (also know as ConFlat) are used in high vacuum and ultra-high (UHV) applications. CF vacuum hardware is preferred in these applications due to its low outgassing and superior vacuum sealing capability. CF vacuum connections are usually all metal seals including most times copper gasket material. These seals are can be heated to 400C to bake-out to minimize out-gassing.

How CF Seals Work 

CF seals normally operate with the principal of a knife edge seal. The flange edge is formed as it is tightened cuts an indention into the softer usually copper gasket. This knife edge is able to seal the vacuum system from atmosphere. Sizing of CF vacuum flanges is from 1.33" to 16" OD. Bolts either tapped to untapped are used as the seal force mechanism.

Materials of Construction

CF Fittings are usually constructed with 304 stainless steel. Upon request, 316L SS can be provided. gasket material is most commonly high purity, oxygen-free (OFHC) copper. Vito gaskets can be provided for applications where ultra-high vacuum is not needed. Advantage of CF fittings is that they can be baked to 400C.

Links to Apex Science Online Store

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CF 45 degree Elbow
CF Tee
CF Cube 6-way

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Con Flat Blank Flange
Con Flat Blank Flange
Con Flat Bolt Set
Con Flat Copper Gasket

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