Specific resistance (at 20° C)
| Substance | Resistance level, μOhm - mm2/m |
|---|---|
| Aluminum | 0,028 |
| Tungsten | 0,055 |
| Iron | 0,098 |
| Gold | 0,023 |
| Constantan | 0,44-0,52 |
| Brass | 0,025-0,06 |
| Manganine | 0,42-0,48 |
| Copper | 0,0175 |
| Molybdenum | 0,057 |
| Nickelin | 0,39-0,45 |
| Nickel | 0,100 |
| Tin | 0,115 |
| Mercury | 0,958 |
| Lead | 0,221 |
| Silver | 0,016 |
| Tantalum | 0,155 |
| Fechral | 1,1-1,3 |
| Chromium | 0,027 |
| Zinc | 0,059 |
| Substance | К | Substance | К |
|---|---|---|---|
| Aluminum | 0,0042 | Tin | 0,0042 |
| Tungsten | 0,0048 | Platinum | 0,004 |
| Constantan | 0,2 | Mercury | 0,0009 |
| Brass | 0,001 | Lead | 0,004 |
| Copper | 0,0043 | Silver | 0,0036 |
| Manganine | 0,3 | Steel | 0,006 |
| Molybdenum | 0,0033 | Tantalum | 0,0031 |
| Nickel | 0,005 | Chromium | 0,006 |
| Nickelin | 0,0001 | Fechral | 0,0002 |
| Nichrome | 0,0001 | Zinc | 0,004 |
Resistance alloys
- Constantan (58.8 Cu, 40 Ni, 1.2 Mn)
- Manganine (85 Cu, 12 Mn, 3 Ni)
- Neusilber (65 Cu, 20 Zn, 15 Ni)
- Nickel (54 Cu, 20 Zn, 26 Ni)
- Nickel (67.5 Ni, 15 Cr, 16 Fe, 1.5 Mn)
- Reonate (84Cu, 12Mn, 4 Zn)
- Fechril (80 Fe, 14 Cr, 6 Al)
Nichrome specific resistance
Let us consider the electronic theory of this phenomenon. As free electrons move through a conductor, they constantly encounter other electrons and atoms in their path. Interacting with them, the free electron loses part of its charge. Thus, the electrons encounter resistance from the material of the conductor. Each body has its own atomic structure, which offers different resistance to electric current. The unit of resistance is taken to be ohms.
The resistance of each individual conductor (denoted by R or r.) depends on the properties of the material from which it is made. In order to accurately characterize the electrical resistance of a particular material, the notion of specific resistance (nichrome, aluminum
- X15N60 - 1.13 Ohm*mm2/m
- X23Yu5T - 1.39 Ohm* mm2/m
- X20N80 - 1.12 Ohm* mm2/m
- CrN70U - 1.30 Ohm* mm2/m
- CrN20US - 1.02 Ohm* mm2/m
Application
High level of specific resistance of nichrome and fechral allows to use these materials in the production of heating elements. The most common products are nichrome filament, ribbon, strip X15N60 and X20N80 as well as X23NU5T ferrule wire for heating devices, household appliances and electric heating elements of industrial furnaces.
