Because the permanent mold itself tends to chill the molten metal, castings produced in a permanent mold are sounder than sand castings. This chilling effect not only enhances the structural integrity of the casting but also contributes to a smoother finish. Permanent mold casting generally results in a smoother surface compared to sand casting, reducing the need for extensive finishing work.

Reduced Finishing Needs: Permanent mold castings typically require less finish work and polishing than sand castings. This is because the smoother finish is inherent to the casting process itself, saving time and resources in post-production.

Additional Smoothing Processes: While permanent mold casting offers a naturally smoother finish, additional processes such as polishing can be used to further enhance the smoothness of the final product. This applies to both permanent and sand casting methods, though permanent mold casting starts with a smoother baseline.

Incorporating these benefits, permanent mold casting stands out as an efficient choice for producing high-quality parts with superior surface finishes.