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Lens Blocking Alloy 117 ( 47oC )
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| Alloy equivalents: |
AIM 47, CerroLOW 117, Indalloy 117, Ostalloy 117, Asarcolo 117 |
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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.
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Melting Point: Eutectic 47ºC
Weight lb/in3: Approx 0.33
Brinell Hardness: Approx 14.5
Growth After Casting: (Shrinkage) Approx 0.0002" Per inch |
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| Lens Blocking alloy 117 |
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This material is available in the following forms
Ingot: 1 Kg |
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Lens Blocking alloy 117 is primarly used for Holding Plastic/glass lenses during grinding operations. It can also be used for proof casting where low temperatures are necessary.
Beacuse of its low eutectic melting properties this Lens alloy has found uses in fuses for safety devices. Also fusible mandrels.
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