Ceramic wares for laboratory, chemical or other technical uses
Ceramic articles having a hardness equivalent to > 9 on the mohs scale, for chemical or other technical uses (excl. of porcelain or china, refractory ceramic goods, electrical devices, insulators and other electrical insulating fittings)
Ceramic wares for laboratory, chemical or other technical uses, of porcelain or china (excl. refractory ceramic goods, electrical devices, insulators and other electrical insulating fittings)
Ceramic wares for chemical or other technical uses (excl. of porcelain or china, articles having a hardness equivalent to > 9 on the mohs scale, millstones, polishing stones, grindstones and the like of heading 6804, refractory ceramic goods, electrical devices, insulators and other electrical insulating fittings)