In 2018, the U.S. Department of the Interior identified bismuth as one of 35 “critical” minerals
Critical is defined as
Furthermore, the United States supply of bismuth is 90% reliant on imports and China controls over 80% of total world production
This is the first step in Mueller’s commitment to eliminate use of materials that do not meet the definition of lead-free for all components in our waterworks product.
Silicon is the second most abundant element in earth’s crust while bismuth is only about twice as abundant as gold and is a byproduct of lead mining.
Lower melt temperature, density, and slag (melt loss) than bismuth-copper alloys or leaded red brass.