Invar

The Invar is a Alliage of Fer (64  %) and of Nickel (36  %) with a little Carbon and Chromium. This invention is due to the Suisse Charles Edouard Guillaume (Nobel Prize of physique 1920).

Thanks to its weak thermal dilation coefficient (approximately 10-6  K -1 in length; certain nuances have negative dilation coefficients), it is used to produce precision instruments:

  • Clock industry
  • Topography
  • detecting measuring devices physique of laboratory
  • of seismic activity
  • frameworks Shadow mask
  • valves of engines
  • lining of the cisterns of Methane tanker
  • printed circuits electronics

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