Nivaflex

Nivaflex is an octavariant alloy important in watchmaking, used primarily for the mainspring.[1] The name was registered as a trademark in 1957 by Reinhard Straumann, a Swiss metallurgist.[2][3] Nivaflex is "wholly non-magnetic" and displays a very low coefficient of thermal expansion.[4] Its composition is of 45% cobalt, 21% nickel, 18% chromium, 5% iron, 4% tungsten, 4% molybdenum, 1% titanium and 0.2% beryllium; carbon content is less than 0.1 percent of the alloy's weight.[5]

References
  1. Brunner, Gisbert (18 April 2015). "Throwing A Curve: The How, What, When, Where and Why Of Mainsprings". Ebner Publishing International. Watchtime.
  2. Müller, Reto (29 June 2012). "Reinhard Straumann". Historischen Lexikons der Schweiz.
  3. "Nivaflex - 132272". ipaustralia.com.au. 24 August 2012.
  4. "Nivaflex 45/5 Wire" (PDF). Jacques Allemann SA. Retrieved 3 April 2021.
  5. Forster, Jack (6 January 2020). "In-Depth Consider The Mainspring". Hodinkee Inc.
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