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LOW MELTING POINT ALLOYS – PRESS ALLOY, LENS ALLOY AND BEND ALLOY

Posted June 10th 2016

Low melting point alloys are important and at William Rowland we produce a range of them, conforming to industry standards, or customer specifications (where practical). Below are some of our most popular alloys.

Press alloy is a low melting point alloy and a eutectic. Eutectic alloys have two or more materials and a eutectic composition. It is also a bismuth based alloy. Press alloy has a sharp melting point of 138°C and expands on solidification like the majority of bismuth based alloys. The low melting point of press alloy means it is easy and safe to handle. It can also be used indefinitely under normal conditions. Composed of 58% bismuth and 42% tin, it is supplied in 1kg ingots.

Lens alloy is another bismuth based alloy which also contains indium giving it an extremely low melting point. It is eutectic, with a melting point of 58°C making it an ideal material for use as a holding medium , or ‘button’ in lens grinding. William Rowland produces several different compositions of lens alloy usually made up of bismuth, indium, tin and lead in varying percentages. Cadium can also be added. Lens 117 alloy, for example, is composed of 44.7% bismuth, 22.6% lead, 19.1 % indium, 8.3% tin and 5.3% cadmium. It is supplied in various forms and sizes.

Bend alloy is the most widely used fusible alloy in the industry. It is also popularly known as Wood’s metal after Barnabas Wood, a dentist and inventor who discovered the alloy in 1860. It is a eutectic alloy and is composed of 50% bismuth, 26.7% lead, 13.3% tin and 10% cadmium. It has many applications and be used as a solder, a casting metal, a coupling fluid in heat baths and a seal for fire sprinklers to name but a few. It is also commonly used as a support for thin-walled metal tubing during bending operations, chiefly due to its characteristic of expansion on solidification. Bend alloy is supplied in 1kg ingots rather than various forms and sizes.

Contact us for information on our 158 deg alloys and 281 deg alloys.

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