Copper & Articles Thereof

Refined copper (7403) covers unwrought copper with a copper content of 99.85% or more by weight, or copper containing other elements added for specific purposes within defined limits set in the chapter notes. Copper alloys — including brass (copper-zinc) and bronze (copper-tin) — are classified within the same headings for wrought forms but are distinguished by their alloy composition. The chapter notes define the alloy thresholds, and the specific alloy type can affect both the heading and the applicable duty rate.

No. Copper wire under 7408 is uninsulated drawn wire. Insulated electrical conductors and cables — regardless of copper content — are classified in the chapter covering electrical wire and cable, not here. The distinction is whether the wire has an electrical insulating coating or sheath; if it does, it leaves this chapter entirely.