Bars and rods have uniform solid cross-sections (circular, square, rectangular, or polygonal), while profiles have cross-sections of other shapes — such as T, L, or custom architectural forms — produced by extrusion or rolling. All fall within 790400 under the US schedule, but the physical description on the commercial invoice should accurately reflect the cross-sectional geometry to avoid classification disputes.

Zinc wire is predominantly consumed in thermal spray (metallizing) applications, where it is arc-sprayed onto steel structures — bridges, tanks, and offshore equipment — to provide galvanic corrosion protection. It is also used in wire flame-spray processes for repair and maintenance coating. Demand is closely tied to infrastructure maintenance and marine construction activity.