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Formula: Fe 64/Ni 36
Form: Foil/Film/Sheet
Material: Invar®
Commodity: Alloys
Invar Foil, also known as Invar Alloy Foil or Fe-Ni36 Alloy Foil, is highly regarded for its unique property of having an extremely low coefficient of thermal expansion (CTE). This characteristic makes it an ideal material for applications requiring precise dimensional stability under varying temperatures. Invar Foil is extensively used in the aerospace industry for components such as satellite structures and precision instruments, as well as in the electronics industry for shadow masks and photomasks. The foil’s stability and reliability are further enhanced by its resistance to oxidation and corrosion. Goodfellow supplies high-quality Invar Foil, ensuring it meets stringent industry standards and delivers consistent performance. Goodfellow’s Invar Foil is engineered to support advanced technological applications, providing a dependable solution for critical industrial needs.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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Tolerances

Foil/Film/Sheet
Thickness <0.01mm ±25%
Thickness 0.01mm - 0.05mm ±25%
Thickness >0.05mm ±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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