… andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths. …
Explanatory notes
… andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths (+). 2508.10 ‑ … The characteristic properties of these products are plasticity, the faculty of hardening when fired and … even if they have been heated to remove some or most of the associated water (to produce absorbent clay) or when fully …