Beryllium copper has long been used for complex moldmaking applications because of its good thermal conductivity, which ensures better control over cooling rates, leading to decreased cycle times, increased productivity and reduced manufacturing costs. However, moldmakers often overlook surface treatment as a way to further maximize mold life and performance. It's important to know up front that plating does not affect the integrity of the beryllium copper, because it does not have an insulating effect. Whether coating with chrome, electroless nickel, electroless nickel co-deposited with polytetrafluoroethylene (PTFE), or boron nitride, the base material's thermal conductivity properties remain intact. What is gained is increased protection due to added hardness. Another benefit of plating is that the coating serves as a wear indicator. When the color of the beryllium copper starts to show through, it's a signal that maintenance will soon be required. Usually, wear first occurs around or opposite the gate.
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