Heat sink  Go To Index Hetero-junction  

    Heating element, heater

    Since solder (Sn-Pb) has a low melting temperature, it is often melted by using natural gas. However, precise temperature control is difficult and this can be better achieved with heating elements. The table below lists the most common heating wires together with their chemical composition. Wires made of iron-chromium are also often referred to as Nichrome wires.

    Chemical composition of heating wires
    Chemical composition Specific resistance (20 °C) µΩ cm Maximum operating temperature (°C)
    Element Ni Cr Al Mn C Si Fe    
    Nichrome
    type 1
    75-79 18-20   <2,5 <0,15 0,5-1,5 <1,5 108 ± 7 1100
    Nichrome
    type 2
    >57 15-18   <3,0 <0,20 0,5-1,5 Rest 112 ± 7 900
    Iron-chromium
    type 1
      23-26 3,5-5,5 <1,0 <0,15   Rest 140 ± 8 1200
    Iron-chromium
    type 2
      17-21 2-4 <1,0 <0,15   Rest 122 ± 7 1100
    Chemical composition of heating wires