Manganin is a trademarked name for an alloy of typically 86% copper, 12% manganese, and 2% nickel.
A resistance alloy with moderate resistivity and low temperature coefficent. The resistance/temperature curve is not as flat as the constantans nor are the corrosion resistance properties as good.
| Ni | Mn | Fe | Si | Cu | Other | ROHS Directive |
| Cd | Pb | Hg | Cr |
| 2~5 | 11~13 | <0.5 | micro | Bal | - | ND | ND | ND | ND |
Synonyms
Manganin, Manganin Alloy, Manganin shunt, Manganin strip, Manganin wire, Nickel plated copper wire, CuMn12Ni, CuMn4Ni, Manganin copper alloy, HAI, ASTM B 267 Class 6, Class 12, Class 13. Class 43,
Chemical Properties
86% copper, 12% manganese, and 2% nickel
| Physical properties |
| Density(ρ) | 8.4 g/cm3 |
| Mechanical properties |
| Tensile Strength (σt) | 300–600 MPa |
| Elongation at break | <50% |
| Izod impact strength | 107 J/m |
| Thermal properties |
| Melting temperature | 1020 °C |
| Thermal conductivity (k) at 23 °C | 22 W/(m·K) |
| Linear thermal expansion coefficient | (14–19)×10−6 K−1 |
| Specific heat capacity | 0.097 cals/gm |
Manganin foil and wire is used in the manufacture of resistors, particularly ammeter shunts, because of its virtually zero temperature coefficient of resistance value and long term stability. Several Manganin resistors served as the legal standard for the ohm in the United States from 1901 to 1990. Manganin wire is also used as an electrical conductor in cryogenic systems, minimizing heat transfer between points which need electrical connections.
Manganin is also used in gauges for studies of high-pressure shock waves (such as those generated from the detonation of explosives) because it has low strain sensitivity but high hydrostatic pressure sensitivity. Source: Wikipedia
Resistance of Wires - 20 deg C Manganin Q = 44. x 10-6 ohm cm Gage B&S / ohms per cm / ohms per ft 10 .000836 .0255 12 .00133 .0405 14 .00211 .0644 16 .00336 .102 18 .00535 .163 20 .00850 .259 22 .0135 .412 24 .0215 .655 26 .0342 1.04 27 .0431 1.31 28 .0543 1.66 30 .0864 2.63 32 .137 4.19 34 .218 6.66 36 .347 10.6 40 .878 26.8 Manganin Alloy CAS Number: CAS# 12606-19-8
