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47ºC
lens alloy blocking alloy
Lens alloy 117 is one of an interesting range of Bismuth based alloys to which the element Indium is added to give a substantially lower melting point. Lens alloy is a eutectic, ie it has a sharp meting point, in this case only 47ºC. At this low temperature it has proved ideal for use as a holding medium or 'Button' in plastic lens grinding. It is easily melted, applied and finally melted off and having extremely stable characteristics, can be re-used repeatedly.
Data
Melting Point: Eutectic 47ºC
Weight lb/in3: Approx 0.33
Brinell Hardness: Approx 14.5
Growth After Casting: (Shrinkage) Approx 0.0002" Per inch
Uses
Holding Plastic/glass lenses during grinding operations.
Proof casting where low temperatures are necessary.
Fusible mandrels.
Fuses for safety devices.
This material is available in the following forms
1 Kilo ingots

Other sizes on request
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