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You are here: Home > Low Melt/Fusible Alloys
These are the same alloys that are also known as CerroSafe or Cerro Metal. All of the alloys below are cast into Cup Cake Pugs. The names we use are the approximate melting temperature in degrees Fahrenheit as they have no definite melting point.

RotoMetals fusible alloys are low melting temperature alloys that contain bismuth, lead, tin, cadmium or indium. They are utilized in a broad variety of tool & die applications including casting, tube bending, machining parts for soft metal dies, fixturing, anchoring parts, toggle dies and supporting castings and interrupted cuts. As these silvery white alloys expand only ~3.3% of their volume when changing from liquid to solid form, they are ideal for many industrial applications. These alloys are normally used in gravity casting but also can be used in other casting methods.

RotoMetals in the largest USA made fusible alloy supplier for a broad range of Tool & Die applications.

Price is per Ingot. 

Type/ Approx Temp in F Antimony Bismuth Cadmium Lead Tin Indium
Roto117F0%44.7%5.3%22.6%8.3%19.1%
Roto136F0%49%
0%
18%
12%
21%
Roto140F0%47.5%
9.5%
25.4%
12.6%
5%
Roto144F0%32.5%0%0%16.5%51%
Roto147F0%48%
9.6%
25.6%
12.8%
4%
Roto158F 0% 50% 10% 26.7% 13.3% 0%
Roto158-190F 0% 42.5% 8.5% 37.7% 11.3% 0%
Roto203F 0% 52.5% 0% 32% 15.5% 0%
Roto212F
0% 39.4% 0% 29.8% 30.8% 0%
Roto217-440F 9% 48% 0% 28.5% 14.5% 0%
Roto255F 0% 55.5% 0% 44.5% 0% 0%
Roto281F 0% 58% 0% 0% 42% 0%
Roto281-338F 0% 40% 0% 0% 60% 0%

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Roto255F Low Melt Fusible Bismuth Based Alloy Ingot Roto203F Low Melt Fusible Bismuth Based Alloy Ingot Roto158-190F Low Melt Fusible Bismuth Based Alloy Ingot Roto158F Low Melt Fusible Bismuth Based Alloy Ingot (Wood's Metal)
Base Price: $13.41
Base Price: $13.71
Base Price: $14.11
Base Price: $14.11
Roto212F Low Melt Fusible Bismuth Based Alloy Ingot Roto217-440F Low Melt Fusible Bismuth Based Alloy Ingot Roto281-338F Low Melt Fusible Bismuth Based Alloy Ingot Roto281F Low Melt Fusible Bismuth Based Alloy Ingot
Base Price: $14.11
Base Price: $14.11
Base Price: $17.14
Updated Price: $15.29
You save $1.85!
Base Price: $17.14
Updated Price: $15.29
You save $1.85!
Lead-free, Fishing Tackle Weight Bismuth-Tin Alloy Roto117F Low Melt Fusible Bismuth Based Ingot Alloy Ingot Roto136F Low Melt Fusible Bismuth Based Ingot Alloy Ingot Roto140F Low Melt Fusible Bismuth Based Alloy Ingot
Base Price: $17.14
Updated Price: $15.29
You save $1.85!
Base Price: $47.40
Base Price: $49.43
Base Price: $59.52
Roto147F Low Melt Fusible Bismuth Based Alloy Ingot Roto144F Low Melt Fusible Ingot Alloy (Field's Metal) Low Melting Point -2 F Alloy Galinstan 50 Grams
Base Price: $59.52
Base Price: $69.61
Base Price: $190.66
   
 
Typical Uses-

Roto158F Fusible Alloy - Anchor bushings in drill jigs, internal or external support of delicate parts for machining, cores for spinning, fusible mandrels in filament winding, fiberglass lamination, drop hammer and embossing dies, tube bending filler (up to 1-3/4" diameter), heat transfer medium in processing plastics, chemicals, etc. (up to 255F), shielding blocks for nuclear medicine.

Roto158-190F Fusible Alloy - Toy soldier casting, proof-casting cavities (threads, dies, molds, blind holes), duplicate patterns in foundry match-plate making, supporting work pieces while machining, spray coating wood patterns, masks for electroplating and spray-painting.

Roto203F Fusible Alloy - Cadmium-Free alternative for RotoLow 158F for nuclear medicine.

Roto212F Fusible Alloy - A tin/bismuth alloy (containing lead) which melts at the low temperature of 212.

Roto217-440F Fusible Alloy - Originated by GE for anchoring punches in dies. Used to anchor non-moving parts in machinery; hold down bolts in concrete floors, locator parts in tooling docks, split jaw chucks, jigs, fixtures, metal forming dies, form blocks, joggle jaws, repairing broken dies, filling blowholes in castings.

Roto255F Fusible Alloy - Anchor cutlery handles, inserts in wood, metal parts in glass (Tuflex doors), make fusible spinning chucks, mandrel for electroforms, drop hammer dies, stretch form blocks, molds for plaster, plastics, tube bending filler (over 1-3/4" diameter), hydrodynamic forming, seamless fittings, duplicate patterns in pottery and foundry, liquid metal in autoclaves, heat-treating, heat transfer (up to 327 F), shielding blocks for nuclear medicine.

Roto281F Fusible Alloy - Anchor shafts in permanent magnet rotors, locator members in aircraft assembly fixtures, metal parts in glass, magnets in fixtures, make nests for parts in jigs and dial feed stations, cores for electroforming, embossing dies, form blocks, joggle jaws, lost wax pattern dies, duplicate foundry patterns, tracer models in profiling, molds for plastics, sheet plastics, plastic teeth, prosthetic development, potting electronic components, laps for rifle barrels.

Roto281-338F Fusible Alloy - Parallels Roto281F Fusible Alloy in its end uses, electroforming mandrels, lost wax pattern dies due to greater dimensional accuracy, olding jet turbine engine blades for machining.