Industrial molds — including injection molds, die-casting dies, and compression molds used to shape plastics, rubber, and metals — are precision tooling assets that often represent significant capital investment and are subject to complex valuation rules at US Customs. Molds are frequently manufactured offshore (notably in China, Canada, and Mexico) and imported either as standalone goods or as assists provided to foreign manufacturers, which triggers separate customs valuation and duty implications. Classification under HTS Chapter 84 depends on the mold's intended material — plastic injection molds, glass molds, and metal die-casting dies each fall under distinct subheadings with potentially different duty rates.

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