Resistance wire

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Resistance wire is a type of high resistance electrical wire. The wire resists the flow of electricity, and converts the electrical energy into heat.[1]

Application for resistance wire includes resistors, heating elements, electric heaters, electric ovens, toasters, and many more.


Nichrome, a non-magnetic alloy of nickel and chromium, is commonly used to make resistance wire because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, resistance wire is usually wound into coils. One difficulty in using nichrome wire is that common electrical solder will not stick to it, so the connections to the electrical power must be made using other methods such as crimp connectors or screw terminals.

Constantan is another material which is often used. It has low temperature dependence and is easily soldered.

Kanthal (Alloy 875/815), a family of iron-chromium-aluminium (FeCrAl) alloys used in a wide range of resistance and high-temperature applications is also used in the form of resistance wires.

Other commonly used resistance alloys include: Evanohm (Alloy 800), Advance© (Cupron or Alloy 45), Midohm© (Alloy 180), Balco (Alloy 120), Alloy 30, Alloy 60, Alloy 90[2]

Common Alloy Trade Names[edit]


MWS Wire Ind. Carpenter Tech. Driver-Harris Harrison Hoskins Jelliff Kanthal
MWS-875 Alchrome 875 HAI-FeCr AI 25 Alloy 875 Kanthal A-1
MWS-800 Evanohm Karma HAI-431 Chromel R Alloy 800 Nikrothal L
MWS-675 Tophet C Nichrome HAI-NiCr 60 Chromel C Alloy C Nikrothal 6
MWS-650 Tophet A Nichrome V HAI-NiCr 80 Chromel A Alloy A Nikrothal 8
MWS-294 Cupron Advance HAI-CuNi 102 Copel Alloy 45 Cuprothal 294
MWS-180 180 Alloy Midohm HAI-180 Alloy 380 Alloy 180 Cuprothal 180
MWS-120 Balco Hytemco HAI-380 Alloy 120
MWS-90 90 Alloy #95 Alloy HAI-90 Alloy 290 Alloy 90 Cuprothal 90
MWS-60 60 Alloy Lohm HAI-60 Alloy 260 Alloy 60 Cuprothal 60
MWS-30 30 Alloy #30 Alloy HAI-30 Alloy 230 Alloy 30 Cuprothal 30