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Formula: Fe64/Ni36
Form: Disk
Material: Invar®
Commodity: Alloys
Hazard Pictogram:
GHS07,GHS08
Invar® disks are made from a nickel-iron alloy with a very low coefficient of thermal expansion and high strength. They’re commonly used in precision instruments and devices where dimensional stability is critical, such as optics, electronics and aerospace applications. With minimal thermal expansion, Invar allows for consistent performance across a wide temperature range. Goodfellow offers Invar® disks in a choice of sizes to suit different design requirements.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Tolerances
Disk
| Thickness | >0.05mm | ±10% |
|---|---|---|
| Thickness | <0.01mm | ±25% |
| Thickness | 0.01mm - 0.05mm | ±15% |
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 |