INVAR (42)

Has the lowest CTE between 20-300 degrees °C.

Also known as N 42, created in 1899 as a variation on INVAR 36 with around 41-42 % of nickel, whereas INVAR 42 has the lowest CTE between 20-300 °C. PHYNICX INVAR 42 is melted under vacuum in general. Applicable norm is ASTM F30.

The chemical composition is:

INVAR 42

Nickel (Ni): 41%
Manganese (Mn): ≤ 0,8%
Iron (Fe): Balance

The expansion properties are:

INVAR 42

30-300°C [x10-6/K]4 - 4,7
30-450°C [x10-6/K]6,7 - 7,4



Typical functions in technologies

  • Metal to glass sealing
  • Lead frames
  • Metal to ceramic sealing
  • Spacers
  • Malls (composite manufacturing)

Typical industries that apply this material in their technology

  • Semiconductor
  • Aerospace
  • Medical
  • Military
  • Optical
  • Electronics
  • Tooling
  • Lighting

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