Common trade names: Invar 42, Nilo 42

Overview

42NiFe is an iron-nickel controlled expansion alloy suitable to glass sealing, with optimal chemical composition to obtain hermetic seals. Typical applications are integrated circuit lead frames, electron gun components, enamelled resistor ferrules and moulds for composite parts.

42NiFe shows almost negligible expansion up to 300°C and possesses large value of magnetic permeability. It is extensively utilized in the aerospace industries and manufacturing thermostat rods.

Mechanical property

Alloy State	Tensile Strength, N/mm²	Yield Strength, N/mm²	Elongation, %
Wire	490.00	250.00	43.00

Physical properties

Density (g/cm3)	Resistivity at 20 oC (μohm.cm)	Melting To (oC)	Curie To (oC)	Specific heat (J/g oC)	Termal conductivity at 20 oC (W/m/oC)
8.15	63.0	1425.0	330.0	0.5	12.5

Characteristics

• lower thermal expansion
• good magnetic permeability

Applications

• lead cables
• electronic operations
• glass sealing and vacuum equipments