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Constantan® Disk
Available Configurations
Properties common to all products in this list
| Thickness | Diameter | Temper ⓘ |
|---|---|---|
| 0.005mm (foil) to 1mm (sheet) | 4mm to 50.8mm | As rolled Annealed |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
Constantan® Disk (Cu55/Ni45) is a precision-engineered circular component in the copper-nickel alloy renowned for its stable electrical resistivity over a wide temperature range and excellent corrosion resistance:
Stable Resistive Behavior & Low Thermal EMF Against Copper
With a nominal composition of 55% copper and 45% nickel, the alloy's low thermal EMF against copper and consistent resistive behavior make Constantan® Disk a preferred material for electrical measurement and calibration applications where predictable, temperature-independent resistance is the defining requirement.
Ready-to-Use Disk Geometry for Strain Gauges & Resistance Standards
Its disk form is ideal for use in strain gauges, resistance standards, and precision shunt resistors, where the geometry provides a ready-to-use platform for direct integration into measurement assemblies without additional shaping required before incorporation into instrumentation.
Excellent Corrosion Resistance for Long-Term Measurement Reliability
Excellent corrosion resistance ensures Constantan® Disk maintains its stable electrical performance over extended service periods — a critical requirement for high-accuracy instrumentation, load cells, and thermal sensors where measurement drift due to surface degradation would compromise long-term accuracy.
Trusted Across Aerospace, Electronics & Metrology for High-Accuracy Instrumentation
Industries such as aerospace, electronics, and metrology rely on constantan disks for high-accuracy instrumentation, load cells, and thermal sensors — applications where the alloy's combination of resistive stability and corrosion resistance directly supports measurement precision and long-term reliability.
Well-Characterized Reference Specimen for Resistance Stability & Thermoelectric Research
In research, Constantan® Disk serves as a well-characterized reference specimen for resistance stability and thermoelectric studies, providing a defined circular geometry for systematic investigation of the alloy's resistive and thermoelectric behavior under controlled experimental conditions.
Industrial Applications
Constantan® Disk is used across precision instrumentation, load cell manufacture, and resistance measurement research wherever a stable, corrosion-resistant copper-nickel disk component is required:
- ✦ Wheatstone Bridge Circuits for Strain Measurement
- Used in Wheatstone bridge circuits for strain measurement, where Constantan® Disk's stable resistive behavior and low thermal EMF against copper ensure accurate, temperature-independent strain readings across the operating range of the measurement system.
- ✦ Thermoelectric Compensation Systems
- Applied in thermoelectric compensation systems, where the disk's low thermal EMF against copper provides the predictable thermoelectric behavior required to compensate for temperature-induced measurement errors in precision electrical instrumentation.
- ✦ Specialized Resistance Networks in Laboratory Equipment
- Used in specialized resistance networks in laboratory equipment, where Constantan® Disk's consistent resistive performance and ready-to-use disk geometry support direct integration into precision measurement and calibration apparatus.
- ✦ High-Accuracy Instrumentation, Load Cells & Thermal Sensors
- Used in high-accuracy instrumentation, load cells, and thermal sensors across aerospace, electronics, and metrology industries, where the combination of stable resistivity and excellent corrosion resistance supports long-term measurement reliability in demanding service environments.
- ✦ Resistance Stability & Thermoelectric Studies Research
- Used in research as well-characterized reference specimens for resistance stability and thermoelectric studies, providing a defined circular geometry for systematic investigation of the alloy's behavior under controlled experimental conditions.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 100-300 |
| Elongation at break( % ) | 45 |
| Modulus of elasticity( GPa ) | 162 |
| Izod impact strength( J m⁻¹ ) | 107 |
| Tensile strength( MPa ) | 400-590 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 52 |
| Temperature coefficient( K⁻¹ ) | 0.00002+/- |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 500 |
| Melting point( C ) | 1225-1300 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 19.5@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 14.9@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.9 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Diameter | ±0.5mm |