Lubrication advances extend life of dies for United States coins
- Published: Sep 14, 2015, 1 PM
The production life of dies used to strike circulating United States coins at the Denver and Philadelphia Mints has been tripled as the result of research by Dr. Tony Ying, a materials engineer in the manufacturing division at the U.S. Mint.
Ying's research "led to using a metal burnishing formulation that provides lubrication, corrosion inhibition, and metal protectant for the blank burnishing process."
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Ying's formula is used in the production of circulation-quality Jefferson 5-cent coins, Roosevelt dimes, America the Beautiful quarter dollars, and Presidential and Native American dollars, according to the U.S. Mint.
More details on Ying's contributions to U.S. coin production can be found here.
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