Development of an Environmentally Friendly Substitute for Wood's Metal

Report No. ARL-TN-0494
Authors: Stephen A. Aubert and Eric C. Johnson*
Date/Pages: August 2012; 20 pages
Abstract: A new low melting non-toxic eutectic metal composition consisting of bismuth, indium, tin, and silver has been formulated and tested. The new eutectic composition, designated as AJ's metal, consist of 70% bismuth, 15 % indium, 10% tin, and 5% silver. AJ's melts at approximately 80 °C and has a density of 9.03 g/cm3, making it a suitable replacement for Wood's metal. The new metal contains no lead or cadmium, as do most low melting castable compositions, thus providing suitable environmental acceptability. Thermal analysis using differential scanning calorimeter has been completed and is presented along with estimates of specific heat. The cost of the new composition is acceptable as bismuth is its major constituent and the more costly indium and silver content is minimized.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2012