Low Melting Point Alloys

Low Melting Point Alloys

Low Melting Point Alloys (LMPA) or fusible alloys are metal alloys combined of at least 2 of the following elements Bismuth (Bi), Tin (Sn), Lead (Pb), Cadmium (Cd), Indium (In), having a melting point range of 11 – 300 deg C. 

Around 300 different alloys are produced by the international producer and market leader 5N Plus, either as standard or custom made according to the customer demand and specification. The various alloys composition either expand, shrink or stay dimensionally stable during solidification.

All these alloys could be supplied in ingots, sticks, wires, or castings, and could be recycled after use.

The most used alloy is the Bismuth-Tin alloy combined of 52% Bismuth and 48% Tin having a melting temperature of 137 – 138 deg. C. This alloy uses for holding delicate parts for machining, such as holding jet engine blades, to be machined by machine center. After the machining process is done, the alloy could be removed by melting or braking.

Some other main applications of LMPA are:

  • Fusible safety devices
  • Optical lens manufacture
  • Model making
  • Radiation shields
  • Rapid prototype tooling
  • Tube and section bending
  • Pewter cast alloys


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