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Atlas All-Seal Gasket

A reliable alternative to elastomeric O-rings with no permeation.

Atlas All-Seal gaskets offer a dependable all-metal vacuum seal for Ultra High Vacuum and Ultra High Purity regimes.

All-Seal gaskets are compatible with standard dovetail or straight-sided O-ring grooves or can be used free-form.

The clean, non-outgassing seals are metallic and rely on metallic deformation sealing. All-Seal gaskets maintain seals for extended time periods. You can eliminate elastomeric permeation, contamination, and embrittlement with our All-Seal aluminum metallic gasket.

Atlas All-Seals are not elastic and will not return to their original shape. They can, however, be used repeatedly provided they are carefully torqued.

The All-Seal combines the low permeation of metallic seals with the versatility of O-rings.

All-metal seals are the only way to achieve UHV and XHV.  ConFlat (CF) flanges are the gold standard for UHV sealing. They are, however, heavy and bulky… and knife edge seals are not well suited for large or rectangular vacuum ports. Elastomeric O-rings seals have been the only choice for large ports, but they reach their limit due to excessive permeation, even when differentially pumped at high vacuum.  Additionally, the composition of elastomeric O-rings can be a source of contamination.

All-Seal gaskets may be used in a wide variety of geometries while still providing UHV seals.

  • Simple All-Metal Sealing for UHV, XHV, UHP

    The Atlas All-Seal simplifies UHV, XHV, & UHP demountable sealing, enabling smaller, lighter no/low permeation seals. All-Seal gaskets can be applied in many geometries enabling better performance.

  • All-Seal for Ultra High Purity

    Elastomeric seals are sources of contamination. Contaminants are added to elastomers to reduce their inherent permeation, which for many applications becomes a trade-off between permeation and contamination. Atlas All-Seal gaskets are metallic and are considerably cleaner and do not compromise on permeation. They are typically aluminum but are available in other metallic materials (nickel, copper, tin, etc.). Consequently, alternative alloys of All-Seal gaskets can be selected to improve chemical resistance.

  • Versatile All-Metal Gaskets

    The All-Seal gasket combines the low permeation of metallic seals with the versatility of O-rings.

  • All-Seal for Nuclear and Radiation Applications

    Atlas aluminum All-Seal gaskets have a low Z and do not cross-link like elastomeric seals. Consequently they have a low nuclear activation and retain the seal longer than elastomeric O-rings.

  • All-Seal for Existing Chambers

    Atlas All-Seal gaskets enable low and high vacuum chambers that have previously been designed to seal with elastomeric and fluoroelastomers (such as viton, FMK, buna, PTFE, kalrez and Chemrez, teflon, etc.) to be retro-fitted for ultra high vacuum.

Copper Knife-Edge Flare CF-RFF Gaskets

Vacuum connects and bridges the gap (0.094”) between flanges.

CF-Copper Vacuum Gasket: CF flanges & gaskets were originally invented by William Wheeler and other engineers at Varian in an attempt to build a flange that would not leak after baking. The design trapped a 0.08” thick C101 copper ring between metal relief details called knife-edges.

Copper Knife-Edge, Radio Frequency Flare CF-RFF, developed by Brookhaven and CERN, combine UHV vacuum CF seal and radio frequency flare RFF seal.

The CF-RFF gasket is unique. It vacuum connects and bridges the gap (0.094”) between flanges. Vacuum tubes can be connected together by CF knife-edge sealed flanges and Radio Frequency Flare gaskets. The internal radio-frequency can now be connected using an RFF gasket.

Electron Particle Accelerators increase the kinetic energy of charged particles by subjecting the electrons to a radio frequency (RF) source that oscillates the electric potential along the inside surface of the beam-line or accelerator ring. The Atlas RF-CF gasket provides a vacuum knife-edge seal and an RF flare seal to bridge the gap between flanges conducting radio-frequency inside the tube.

Accelerators typically use resonant RF cavities formed from or coated with superconducting materials. Electromagnetic fields are excited in the cavity by coupling an RF source with an antenna. When the RF frequency fed by the antenna is the same as that of a cavity mode, the resonant fields build to high amplitudes. Charged particles passing through apertures in the cavity are then accelerated by the electric fields and deflected by the magnetic fields. The resonant frequency driven in SRF cavities typically ranges from 200 MHz to 3 GHz, depending on the particle species to be accelerated.

For connecting multiple resonant cavities the CF-RFF gasket can be used to maintain the radio signal through the complete cavity assembly.

Atlas offers CF-RFF gaskets for standard size DN Flanges (DN16-DN200):

FLANGE SIZE CF USA SIZE STANDARD OD STANDARD ID CUSTOM IDs ??
DN16 1.33” MINI 0.838” 0.640”
DN25 2.125” 1.290” 1.010”
DN40 or DN35 2.75” 1.895” 1.451”
DN50 3.375” 2.425” 2.010”
DN63 4.50” 3.243” 2.506”
DN75 4.625” 3.598” 3.010”
DN100 6.0” 4.743” 4.010”
DN125 6.75” 5.567” 5.010”
DN160..DN150 8.0” 6.743” 6.007”
DN200 10.0” 8.743” 8.007”
DN250 12.0” 10.73” 10.00”

Please contact us today to discuss your seal and gasket needs.

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