Rose's metal

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Rose's metal, Rose metal or Rose's alloy is a fusible alloy with a low melting point.

Properties[edit]

Rose's metal consists of 50% bismuth, 25–28% lead and 22–25% tin. Its melting point is between 94 °C (201 °F) and 98 °C (208 °F). The alloy does not contract on cooling.

Uses[edit]

Rose's metal has several common uses:

  1. As a solder. It was used to secure cast iron railings and balusters in pockets in stone bases and steps.
  2. As a heat transfer medium in heating baths.
  3. As a malleable filling to prevent tubes and pipes from crimping when bent. Rose's metal is melted and poured into the tube. It then solidifies in place but remains malleable. This allows the tube or pipe to be bent and reworked without crimping. After the desired shape is achieved the Rose's metal is remelted and removed, leaving the pipe or tube in its modified shape.

History[edit]

It was discovered by the German chemist Valentin Rose the Elder, the grandfather of Heinrich Rose.

Similar metals[edit]

Alloy Melting point Eutectic? Bismuth Lead Tin Indium Cadmium Thallium Gallium Antimony
Rose's metal 98 °C (208 °F) no 50% 25% 25%
Cerrosafe 74 °C (165 °F) no 42.5% 37.7% 11.3% 8.5%
Wood's metal 70 °C (158 °F) yes 50% 26.7% 13.3% 10%
Field's metal 62 °C (144 °F) yes 32.5% 16.5% 51%
Cerrolow 136 58 °C (136 °F) yes 49% 18% 12% 21%
Cerrolow 117 47.2 °C (117 °F) yes 44.7% 22.6% 8.3% 19.1% 5.3%
Bi-Pb-Sn-Cd-In-Tl 41.5 °C (107 °F) yes 40.3% 22.2% 10.7% 17.7% 8.1% 1.1%
Galinstan −19 °C (−2 °F) yes <1.5% 9.5-10.5% 21-22% 68-69% <1.5%

See also[edit]

References[edit]