Section XV (Chapters 78 to 83): Base metals and articles of base metal
Base metals and articles of base metal. Chapters 78 to 81
cover particular unwrought base metals (lead, zinc, tin and other base metals)
and products of those metals such as bars, rods, wire or sheets, as well as
Chapters 82 and 83 cover certain specified articles of base
metal which, without regard to the nature of the constituent metal.
In order to classify articles of base metals, one should always check
first if they are covered in chapter 82 or 83, and if not, find the chapter
related to their constituent material.