Permanent mold casting is a metal shaping process in which molten metal is poured into a metal mold, under gravity, centrifugal force, or low pressure, and held until solidification occurs. The process is similar to the sand casting except that the mold is made of metal instead of one-time-use sand. So the mold is more durable ("permanent") and reusable, deliver better surface finish and more dimensional consistency than sand casting.

Typical mold metal is cast iron or alloy steel, which can resist erosion and thermal fatigue. made to two halves of the cavity of the mold using CNC to make the cavity and formed into two halves of the mold. Therefore tooling cost for permanent mold casting will be cheaper than die casting.

Triton's permanent mold casting cast only aluminum alloy A356.

Ideal parts for permanent mold are those with thicker wall, hard to make by die casting, low volume, or those requiring higher surface finish than sand casting and less porosity. For parts with intricate inner cavities, cores or inserts made from resin-bonded sand, plaster, are used in the mold. This is the important feature that die casting does not have.

Permanent mold casting is a precision process. Due to the rapid heat transfer from the molten metal to the mold itself, the castings have finer grain structures and better strength properties than casts made by sand casting method. Permanent mold casting permits designs with thinner walls and less weight than sand casting. Permanent mold castings are less subject to shrinkage and effects from gas such as bubbles in the casting than sand castings and do not contain the entrapped gas often found in die castings.