HS CodesV · Mineral products25 · Salt; sulphur; earths and stone; plastering materials, lime and cement25092509Chapter 25Copy pageChalkDescriptionChalkSubheadings250900ChalkWas this page helpful?YesNoPrevious2508Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earthsNextNatural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk2510