A specialized coating, often containing graphite, silica, or finely ground coal, applied directly to the mold cavity before pouring. The facing prevents the molten metal from penetrating the sand grains or reacting chemically with the mold. This results in a smoother surface on the casting and makes it much easier to separate the sand from the metal during shakeout.
Heard on the job
Dust a heavier layer of facing on the drag half of that mold so the iron doesn't burn in.
Also heard as
- mold wash
- facing sand