Roto117F 1/2 pound Low Melt Fusible Bismuth Based Ingot Alloy Ingot

Sold By the Ingot i.e. 1 Quantity = 1/2 Pound

Fusible Alloys include a group of binary, ternary, quaternary, and quinary alloys containing bismuth, lead, tin, cadmium and indium. The term fusible alloy refers to any of the more than 100 white-metal alloys that melt at relatively low temperatures. 
Fusible alloys are materials that melt at less than 300F, well below the melting point of Tin-lead eutectic solders. The major component of fusible alloys is bismuth. Besides producing low melting point, bismuth also gives these materials the unique characteristic of  expanding on freezing. This expansion, which can continue for hours or even days after freezing, has proven to be a useful property in many processes.
Fusible Alloys are classified as either eutectic or non-eutectic. In eutectic alloys, the melting point coincides with the freezing point. Non-eutectic alloys exhibit a range between the melting and freezing point in which the material is "mushy" or "pasty".
Fusible Alloys are used for lens blocking and tube bending, for anchoring chicks and fixtures and for mounting thin sections such as gas turbine blades for machining. The eutectic fusible alloys, which can be tailored to give s specific melting point, find applications in
temperature control devices and in fire protection devices.

This alloy is a bismuth‑based eutectic material designed for tooling and production support. Its low melting point makes it easy to cast, and once solidified, it is immediately ready for use. The alloy can be recovered and recycled multiple times without significant loss of performance, adding efficiency to manufacturing workflows.

A primary application is in the optical industry, where it is used for lens blocking during the grinding of glass, plastic lenses, and other optical components. Because of its low melting temperature, the alloy provides stable support without distorting the materials it holds. In addition to optics, it is also suitable for proof casting and other specialized tasks where precision and reusability are essential.

#117 Alloy The ingot weighs approximately 1/2 pound and consists of 44.7% Bismuth, 22.6% Lead, 19.1% Indium, 8.3% Tin, and 5.3% Cadmium. 

Ingot dimensions 4" x 1 1/2" x 3/4" Eutectic Alloy

Liquidus: 117F - 47C

Solidus: 117F - 47C

Yield Temperature: 117F

Weight: 0.32 lb/in3

Tensile strength: 5.4 ksi

Slow-load elongation: 1.5%

Brinell hardness: 12

Specific Heat

Liquid: 0.035 Btu/lb-F

Solid: 0.035 Btu/lb-F

Latent heat of fusion: 6Btu/lb

Coefficient of thermal expansion: 14

Electrical conductivity: 3.9% Cu