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Permanent Mold Casting vs Sand Casting: Which one is better?

    Permanent Mold Casting Foundry

    Permanent Mold Casting Foundry

    Permanent Mold casting vs sand casting, which process is better? In the world of metal casting, two prevalent methods, permanent mold casting and sand casting, stand out for their distinct characteristics and applications. This blog aims to unravel the differences between these two casting processes, providing valuable insights for manufacturers and enthusiasts alike.

    Casting Part CNC Machining

    The Basics: Permanent Mold Casting

    Definition and Process

    Permanent mold casting, also known as gravity die casting, involves the use of a reusable mold made from materials like steel or iron. The molten metal is poured into the mold, and gravity facilitates the filling of the cavity, resulting in the desired shape.


    • Improved dimensional accuracy
    • Faster production cycles
    • Enhanced surface finish


    Permanent mold casting is often employed for high-volume production of components such as automotive parts, aerospace components, and household appliances.

    The Essentials: Sand Casting

    Definition and Process

    Sand casting is a traditional casting method utilizing sand molds. A pattern, typically made of wood or metal, is pressed into the sand to create a cavity for pouring molten metal. Once the metal solidifies, the mold is broken, revealing the cast part.


    • Versatility in casting various shapes and sizes
    • Cost-effective for low-volume production
    • Ideal for complex geometries


    Sand casting finds applications in the production of large and complex components, such as engine blocks, pipes, and artistic sculptures.

    Permanent Mold Cast Vs Sand Casting Characteristics

    Mold Material

    • Permanent Mold Casting: Utilizes durable molds made from metal, contributing to better dimensional stability.
    • Sand Casting: Employs molds made from sand, providing flexibility in shape but with lower dimensional accuracy.

    Surface Finish

    • Permanent Mold Casting: Offers a superior surface finish due to the smooth cavity walls of the metal mold.
    • Sand Casting: Yields a coarser surface finish due to the texture of the sand molds.

    Production Speed

    • Permanent Mold Casting: Generally faster production cycles, making it suitable for high-volume manufacturing.
    • Sand Casting: Slower production cycles, often preferred for low-volume and intricate productions.

    Cost Considerations

    • Permanent Mold Casting: Initial tooling costs can be higher, but per-unit costs decrease with higher production volumes.
    • Sand Casting: Lower tooling costs, making it cost-effective for smaller production runs.

    Making the Right Choice

    Factors Influencing the Decision

    • Production Volume: For high-volume production, permanent mold casting may be more economical.
    • Complexity of Design: Sand casting is preferred for intricate and complex designs due to its mold flexibility.
    • Surface Finish Requirements: If a superior surface finish is crucial, permanent mold casting may be the preferred choice.


    In the dynamic landscape of metal casting, the choice between permanent mold casting vs sand casting hinges on various factors, each method offering its own set of advantages. Understanding the distinctions between these processes is vital for manufacturers seeking to optimize their production methods.

    Whether it’s the precision of permanent mold casting or the versatility of sand casting, both methods play crucial roles in fulfilling diverse industry needs. As you navigate the terrain of metal casting, weigh the specific requirements of your project against the strengths of each process, ensuring a casting solution that aligns seamlessly with your objectives.


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