Explanatory notes
… 7603.20 ‑ Powders of lamellar structure; flakes This heading covers aluminium powders as defined in Note 8 (b) to … correspond to those of copper and the Explanatory Note to heading 74.06 therefore applies, mutatis mutandis , to this … and flakes are, however, also used in pyrotechnics, as heat generators (e.g., in the thermit process), to protect …