Explanatory notes
… ‑ Artificial corundum, whether or not chemically defined 2818.20 ‑ Aluminium oxide, other than artificial corundum … such as zirconium dioxide, are excluded ( heading 38.24 ). Artificial corundum is put up in small pieces or … of aluminium hydroxide (soluble alumina) ( heading 38.24 ). (e) Artificial corundum on a backing of paper, …
