316SS-Al Bonded Bimetal CF Flanges

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316SS 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 316SS/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 316 stainless steel facing, 316SS-Al bimetal flange users can capitalize on an aluminum system connection while retaining industry-standard 316SS alloy benefits such as increased strength and 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.