What do a.m. and p.m. stand for?

permanent mold

noun, Metalworking.
a reusable metal mold used for making a large number of identical castings. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for permanent mold
  • Respondent is supplier of high performance, semi-permanent mold aluminum machine castings.
  • In grid caster operation, metal is pumped from a melt pot into a two-part permanent mold.
  • Die casting is a method used to cast finished shapes in a permanent mold cooled by noncontact water.

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