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Formula: Fe64/Ni36
Form: Coil
Material: Invar®
Commodity: Alloys
Hazard Pictogram:
GHS07,GHS08
Invar® Coils are part of our extensive range of specialty metals and come in 45 variations. They’re made from a low expansion nickel-iron alloy with exceptional dimensional stability and resistance to corrosion. These foil coils are commonly used in precision instruments and devices where minimal thermal expansion is critical, such as aerospace applications, optical mirrors and semiconductor manufacturing equipment. With our wide selection of sizes and tempers, Invar® Coils enable designers to find the optimal balance of properties for their specific application.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Tolerances
Coil
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| 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 |