304SS-Al Bonded Bimetal CF Flanges

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304SS to 6061-T6 Aluminum Bimetal ConFlat flanges offer users the unique ability to harness the properties of two different metal alloys in their UHV or XHV processes. LOS 304SS/Al bimetal CF flanges are available in industry-standard sizes (mini 1.33″ to 12.0″), rotatable and fixed geometries, and various bolt hole types.

With a 304 stainless steel facing, 304SS-Al bimetal flange users can capitalize on an aluminum system connection while retaining industry-standard 304SS alloy benefits such as excellent knife edge retention. Aluminum system connections provide increased vibration dampening, decreased outgassing paths, and greater thermal conductivity and diffusivity.

Aluminum Features

  • The thermal conductivity of Al is more than 10x that of stainless steel.
  • The thermal diffusivity of Al is 17x that of stainless steel.
  • Fast uniform bakeouts are achieved with aluminum versus stainless steel. UHV levels with most aluminum chambers can be achieved in less than 24 hours.
  • The Young’s modulus of Al is approximately 1/3 of stainless steel. This means better vibration dampening.
  • Al has 7 orders of magnitude less Hydrogen than stainless steel.
  • Aluminum is magnetically invisible compared to stainless steel.
  • Low-temperature bakeout of 150°C.
  • Aluminum has lower outgassing rates as compared to stainless steel.