John Flanagan wrote:

I'm trying to find out *for sure* wha hte alloy mix is of the
fixturing alloy sold by ENCO. They say it expands by .0002"/inch when
it solidifies and that it melts at 158°F. In the machinist's handbook
they describe an alloy that melts at 158°F made of Bismuth, tin, lead
and cadmium but they don't specify that it expands on solidification.

Anyone have some knowledge about this?

I do know that back in the days of metal type, antimony was added to
type metal to make it expand on solidification. Learned that in Jumior
High Print Shop a loooooooong time ago. :-)

Ted