Sumet bronze

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From Doug Edwards:

Sumet bronzes are leaded tin bearing bronze. Depending on the alloy, they vary from 10% lead to 27% lead.

From Concast Metal Products:

High Lead Tin Bronze
The lead content in these alloys is between 7 percent and 30 percent. High lead tin bronzes are free cutting and retain favorable thermal conductivity and good lubricity due to the lead content. The high lead tin bronzes are ideal for bearing applications where there could be a loss of the lubrication boundary. These alloys perform excellent in unforgiving environments where foreign matter may be present, such as dirt and other foreign materials. The high lead alloys are able to envelope foreign matter due to its malleable nature and in doing so protects the wear surface of mating part such as a shaft.
Leaded Tin Bronze Alloy
The lead content in these bronze alloys is between 7 percent and 15 percent. High leaded tin bronzes alloys are free cutting and retain favorable thermal conductivity and good lubricity due to the lead content. Alloy C93200 is considered this family’s workhorse alloy and is widely used in many bearing applications.

See also Bronze.