Explanatory notes
… (a) Separate chemical elements and separate chemically defined compounds, whether or not containing impurities; … or alkaline‑earth metals (heading 90.01). 4.‑ Chemically defined complex acids consisting of a non‑metal acid of … of these elements or isotopes, whether or not chemically defined, whether or not mixed together; (d) Alloys, …Legal note
… (a) Separate chemical elements and separate chemically defined compounds, whether or not containing impurities; … or alkaline‑earth metals (heading 90.01). 4.‑ Chemically defined complex acids consisting of a non‑metal acid of … of these elements or isotopes, whether or not chemically defined, whether or not mixed together; (d) Alloys, …