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EVAC ISO CeFiX® connections are available in sizes NW16 up to NW250, as standard. This system has been developed completely by EVAC, allowing customers to get a EUHV leakproof connection within seconds.

CeFiX® is the next generation of the old Conflat® (CF) system. The main difference between both is the way of compressing the metal gasket.
The CF knife edge makes a circular line imprint into the gasket. Used a second time, this imprint is always shifted slightly in the micrometer range, due to mechanical tolerances. The intersecting points of two or more imprint circles are causing vacuum leaks, subsequently.

Besides its particle generating nature, the one time usability is the main disadvantage of the CF knife edge.

The completely particle-free area-pressing mechanism of the CeFiX® system allows for reuse of the seals, as the smooth overlapping areas do not exhibit the leaking deficiencies of the deep CF groove imprints. A further advantage of the wide overlapping area with a wide 200 … 400µm crossection is its extensive thermocycling capability with a sheer range of -271 … +450 degC, usually breaking the fragile CF knife edge just after one cycle.

Needless to mention, that such a robust EUHV connection (< 10E-11 mbar, <1 nPa) can carry overpressure of up to 300 bar (using especially certified chainclamps with TÜV approval). This is achieved by using very hard nickel seals, even impossible to penetrate by a CF knife edge, but easily to be compressed using the gear-type force-multiplying mechanism of CeFiX® chain clamps. This technology finally requires only 50% of the CF compression force  at seal surface in order to achieve gas-tight intermetallic diffusion bonds.

EVAC ISO CeFiX® flanges

EVAC ISO CeFiX® flanges

EVAC_ISO_CeFiX_flangenew

Standard sizes: NW 16 … 250

The EVAC ISO CeFiX® flanges are made from one piece of material.

Flanges are made from stainless steel (SUS 316L) and they can be used with EVAC chain clamps for EUHV applications with CeFiX® Aluminium, Copper or Nickel seals.

EVAC ISO CeFiX® Chain Clamps

EVAC ISO CeFiX® chain clamps

chain_clamp-cefix

EVAC ISO CeFiX® chain clamps NW 16…63.

Chain clamps are available in stainless steel, also for antimagnetic requirements with extreme low permeability.

Stainless steel versions can also be used for Food & Beverage applications. They are also compatible to KF, means they work on standard KF flanges.

In combination with EVAC ISO CeFiX® flanges and seals EUHV (

Chain clamps are available in stainless steel.

In combination with EVAC ISO CeFiX® flanges and seals used in EUHV applications and for overpressure.

– can be used for extreme performance applications
– ultra wide temperature range ( -270… +450 degC with nickel seal)

EVAC ISO CeFiX® chain clamps

chain-clamp-cefix2

EVAC ISO CeFiX® chain clamps NW 80…250.

Chain clamps are available in stainless steel.

In combination with EVAC ISO CeFiX® flanges and seals used in EUHV applications and for overpressure.

– can be used for extreme performance applications
– ultra wide temperature range ( -270… +450 degC with nickel seal)

In combination with EVAC ISO CeFiX® flanges and seals used in EUHV applications and for overpressure.

– can be used for extreme performance applications
– ultra wide temperature range ( -270… +450 degC with nickel seal)

EVAC ISO CeFiX® Seals

EVAC ISO CeFiX® seals

seals-cefix

EVAC ISO CeFiX® seals NW 16…250

– available in various materials (aluminium, copper, nickel, silver/gold plated versions)
– seals reusable
– use for cryo applications down to -271 degC
– use for high temperature applications (aluminium: ~ 150 degC; copper: ~ 300 degC; nickel: ~ 450 degC)

EVAC ISO CeFiX® Fittings

EVAC ISO CeFiX® fittings

KF_fittings (Medium)

EVAC ISO CeFiX® fittings NW 16…250.

EVAC ISO CeFiX® fittings allow flexibility in design and construction.

These parts are available as elbows, tees, crosses, or adapters. They are made out of stainless steel (SUS 316L), which ensures excellent system performance.

Also special adapters from Conflat® to CeFiX® are available in all diameters, in order to allow the seamless transition to newer and more compact CeFiX® systems.