For shorter production runs, some plastic injection mold makers will use molds made from aluminum. Aluminum is a perfectly reasonable choice if you will not need the
plastic injection mold to perform long-term. However, if a project requires that a plastic injection mold lasts for several years, an aluminum mold may cost more in the long-run. High-volume precision molds are made from hardened steel. Steel can withstand the pressures of a long production run while still meeting close tolerances.
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