Apex Vacuum CF Flanges and Fittings
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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.