Permanent mold castings typically require less finish work and polishing than sand castings. This is because the process provides a smoother surface finish right from the mold. But the benefits don't stop there. Permanent mold castings can be stronger than die and sand castings and less porous than die castings.

Why are they stronger? The porosity of a sand mold plays a significant role in decreasing the strength of the finished part. Permanent molds, typically made from iron or steel, do not suffer from this issue. The lack of porosity in these molds leads to a denser, more robust final product. This makes permanent mold casting an ideal choice for applications requiring durability and strength.

In summary, by minimizing porosity and enhancing the surface finish, permanent mold casting not only produces aesthetically pleasing components but also significantly boosts their structural integrity.