Controlled Expansion Alloys

NAS 42

An Fe-42% Ni alloy, NAS 42 has a coefficient of thermal expansion close to that of silicon, ceramic and glass. In addition to integrated circuit lead frames, applications include the manufacture of vibrating plates and metal masks. NAS 42 is also used as a soft magnetic material.

  • Image: Coil
  • Image: Sheet


NAS 42 is an excellent choice for use in lead frames when pressing, etching, plating and soldering.

Corrosion resistance

Because NAS 42 does not have the active chromium found in stainless steel, care must be taken to ensure rusting does not occur.


Integrated circuit lead frames, electron tube sealing, magnetic material

Back to top