Materials
Copper Weight
In plain English
How thick the copper wiring is, oddly measured by weight. Thicker copper carries more electricity — like a wider water pipe handles more flow.
The technical version
Copper weight expresses the thickness of a copper foil in ounces per square foot; 1 oz is about 35 microns. Heavier copper carries more current but etches with greater undercut, requiring wider trace spacing. It directly affects DFM minimums, controlled impedance, and current-carrying capacity.