Die Casting vs. Injection Molding

When considering which manufacturing method is best for your application or components, two of the most popular processes include die casting and injection molding. Both manufacturing methods have advantages and disadvantages. Due to their manufacturing similarities, designers and engineers may have a difficult time determining which method is best for their component manufacturing requirements. Before making any decisions, it is important to understand the benefits as well as the differences of each parts manufacturing method.

Die Casting

Die casting is a manufacturing process by which mold cavities are pressure-filled with molten metal to create the component or part. Common alloys used for die cast components include aluminum, magnesium, and zinc.

Benefits of Die Casting

As a highly repeatable process, die casting is capable of manufacturing high volume production runs efficiently Additional benefits of die casting include:

  • Accuracy and dimensional stability
  • Reduction of secondary machinery or finishing
  • Capability of manufacturing complex geometries
  • Uniform component parts

Injection Molding

While similar to die casting, injection molding uses plastic and polymers instead of metal in the manufacturing process. Resins commonly used for injection molding include ABS, polypropylene, TPU, polyethylene, as well as custom plastic materials. 

Benefits of Injection Molding

With plastics becoming more prevalent due to the flexibility they provide, some of the benefits of plastic injection molding include the following:

  • Multiple materials can be used/mixed
  • Accurate finished components
  • Capability of using fillers

Choosing between Die Casting and Injection Molding

Your component’s functionality along with time constraints and/or budget concerns will determine which manufacturing method is best for your requirements.

  • Die casting is ideal for complex geometries that require short lead times
    • Metal cast components provide longevity and durability
  • Labor and material costs are reduced with injection molding
    • Secondary machining can increase injection molding costs

Let Us Help You Find a Die Casting or Injection Molding Manufacturer

Extensive knowledge and expertise along with long-term industry relationships has made us a trusted sourcing servicer for decades. Contact us or call us at 408-205-1319 and let us help you find the right die casting or injection molding manufacturer for your application needs.


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