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Formula: Fe 64/Ni 36
Form: Tube
Material: Invar®
Commodity: Alloys
Hazard Pictogram: GHS07,GHS08
Invar® Tube is a nickel-iron alloy tubing product offered by Goodfellow within its range of specialty metals and alloys. With 14 size variations, Invar alloy tubes are precision drawn seamless tubes valued for their uniquely low coefficient of thermal expansion. The dimensional stability of Invar alloy makes it ideal for applications in precision instruments, optics, antennas, thermal couplings, and glass-to-metal seals.
Technical Data Sheet Safety Data Sheet Tolerance Properties

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Tolerances

Tube
Outside Diameter =<2mm ±0.05mm
Outside Diameter 2mm - 5mm ±0.1mm
Outside Diameter >5mm ±5%
Wall Thickness ±10%

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
Physical Properties
Element Value
Density( gcm⁻³ ) 8

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