Of a width not exceeding 500 mm, hot-rolled, not further worked than clad; of a width exceeding 500 mm, not further worked than surface-treated, including cladding — Painted, varnished or coated with plastics on at least one side, excluding products with a final coating of zinc-dust (a zinc-rich paint, containing by weight 70% or more of zinc) and excluding products with a substrate with a metallic coating of chromium or tin