Invar® Spooled Wire

Formula: Fe 64/Ni 36

Form: Wire

Material: Invar®

Commodity: Alloys

Hazard Pictogram: GHS07,GHS08

Invar® Spooled Wire is a nickel-iron alloy wire product offered by Goodfellow in their extensive range of specialty metals. With 120 variations, this low expansion alloy wire provides precise dimensional stability across a range of applications. The controlled thermal expansion properties of Invar alloy make it well suited for precision instruments, optics, and aerospace components where maintaining exact dimensions is critical. The combination of strength, workability, and dimensional stability has established Invar alloy wire as an important engineering material for demanding applications.

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Technical Data Sheet Safety Data Sheet Tolerance Properties

Health hazard/Hazardous to the ozone layer

Serious health hazard

each

Tolerances

Wire

Diameter		±10%
Length		+5% / -1%

Material Properties for Alloys

Mechanical Properties

Element	Value
Hardness - Brinell	160
Elongation at break( % )	45
Modulus of elasticity( GPa )	140-150
Tensile strength( MPa )	450-590

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	75-85

Magnetic Properties

Element	Value
Curie temperature( C )	279

Thermal Properties

Element	Value
Melting point( C )	1427
Specific heat( J K⁻¹ kg⁻¹ )	515@23°C
Thermal conductivity( W m⁻¹ K⁻¹ )	13@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	1.7-2@20-90°C