| Constantan | |
|---|---|
 A spool of Constantan wire | |
| Material type | Copper-nickel alloy |
| Physical properties | |
| Density (ρ) | 8.885 g/cm3 |
| Mechanical properties | |
| Young's modulus (E) | 162 GPa |
| Tensile strength (σt) | ~450 MPa |
| Elongation (ε) at break | ~0.25% |
| Thermal properties | |
| Melting temperature (Tm) | 1210 °C |
| Electrical properties | |
| Surface resistivity | 0.56 μΩ·m |
Constantan, also known in various contexts as Eureka, Advance, and Ferry, refers to a copper-nickel alloy commonly used for its stable electrical resistance across a wide range of temperatures.[1] It usually consists of 55% copper and 45% nickel.[2] Its main feature is the low thermal variation of its resistivity, which is constant over a wide range of temperatures. Other alloys with similarly low temperature coefficients are known, such as manganin (Cu [86%] / Mn [12%] / Ni [2%] ).
- ^ M. A. Laughton; D. F. Warne (2003). Electrical Engineers Reference Book (16th ed.). Elsevier. p. 10/43. ISBN 0-7506-4637-3.
- ^ J. R. Davis (2001). Copper and Copper Alloys. ASM International. p. 158. ISBN 0-87170-726-8.