Which should you use? It should be apparent right away that if you use injection molding, you are going to end up with plastic parts and if you use die casting, you are going to end up with metal parts. If you know what sort of parts you want to end up with, you know right away which to use. But if you’re not sure which material is better for you and your company’s products, read on. Benefits of Plastic Injection Molding Production is quicker due to more flexibility in the molding process Plastic Injection molds can accommodate different plastic or polymer materials Fillers can be used in plastic molds to increase strength Efficient process with very accurate finishes Benefits of Aluminum Die Casting Efficient process with a high degree of accuracy No need for secondary operations Complicated designs can be more easily cast Produces higher-quality products with better tolerance that will last longer Aluminum Die Casting vs. Injection Molding So why would you choose injection molding over die casting? If you are looking to produce a lot of parts very inexpensively, injection molding might be the way to go, as labor and material costs are fairly light, although it is important to keep in mind that the cost of the plastic injection molding machines themselves and any secondary equipment can be fairly expensive.