An aluminium mold. (Image courtesy of Constellium.) For as long as plastic injection molding has existed, the preferred material for mold cavities has been hardened steel. It is durable, strong and easier to rework if there are design changes. Due to its strength, steel also allows more complex molds to be created versus using an aluminium mold. But aluminium is not without its benefits. Mold cavities made from aluminium can be quicker and cheaper to produce, and offer excellent thermal cond...
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