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What materials are injection molds made of?
2026-01-28
ABS, PC, AS, PS, etc. are reasonable choices for injection mold requirements
1. High corrosion resistance Many resins and additives have a corrosive effect on the cavity surface. This corrosion causes the metal on the cavity surface to dissolve and peel off, deteriorating the surface condition and the quality of the plastic parts. Therefore, corrosion-resistant steel should be used, or the cavity surface should be chrome-plated or nickel-plated.
2. Good wear resistance The gloss and precision of the surface of injection-molded plastic parts are directly related to the wear resistance of the cavity surface of the injection mold. In particular, when some plastics are added with glass fiber, inorganic fillers, and certain pigments, they flow at high speed in the flow path and cavity together with the plastic melt, resulting in great friction on the cavity surface. If the material is not wear-resistant, it will wear out quickly, damaging the quality of the plastic parts.
3. Good dimensional stability During injection molding, the temperature of the injection mold cavity must reach above 300℃. Therefore, tool steel (heat-treated steel) that has undergone appropriate tempering treatment should be selected. Otherwise, it will cause changes in the microstructure of the material, resulting in changes in the dimensions of the injection mold.
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