Explanatory notes
… mechanical or physical processes (except crystallisation), but not products which have been roasted, calcined, obtained … magnesia (heading 25.19 ) may be fused or calcined (dead‑burned (sintered) or caustic‑burned). In the case of dead‑burned (sintered) magnesia, …Legal note
… mechanical or physical processes (except crystallisation), but not products which have been roasted, calcined, obtained …