Cerrosafe

{{Short description|Fusible alloy with a low melting point}}

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 {{convert|70|°C}} and {{convert|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.{{cite web |url= http://www.brownells.com/gunsmith-tools-supplies/barrel-tools/barrel-chamfering-accessories/cerrosafe-reg-chamber-casting-alloy-prod384.aspx |title= Brownells Cerrosafe® Chamber Casting Alloy |accessdate= September 18, 2017 |archive-date= September 18, 2017 |archive-url= https://web.archive.org/web/20170918154301/http://www.brownells.com/gunsmith-tools-supplies/barrel-tools/barrel-chamfering-accessories/cerrosafe-reg-chamber-casting-alloy-prod384.aspx |url-status= dead }}{{cite web |url= http://www.csalloys.com/products-cerrosafe-alloy.html |title= CS Alloys Safe 165, Cerrosafe |accessdate= September 18, 2017 }}