Cerrosafe

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Cerrosafe is a fusible alloy with a low melting point. It is a non-eutectic mixture consisting of 42.5% bismuth, 37.7% lead, 11.3% tin, and 8.5% cadmium that melts between 158 °F (70 °C) and 190 °F (88 °C). It is useful for making reference castings whose dimensions can be correlated to those of the mold or other template due to its well-known thermal expansion properties during cooling. The alloy contracts during the first 30 minutes, allowing easy removal from a mold, then expands during the next 30 minutes to return to the exact original size. It then continues expanding at a known rate for 200 hours, allowing conversion of measurements of the casting back to those of the mold.[1][2]

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%


References[edit]

  1. ^ "Brownells Cerrosafe® Chamber Casting Alloy". Retrieved September 18, 2017.
  2. ^ "CS Alloys Safe 165, Cerrosafe". Retrieved September 18, 2017.

External links[edit]