With an aluminium oxide content of 98,5 % by weight or more
Artificial corundum, whether or not chemically defined, with > 50 % of the total weight having a particle size > 10 mm (excl. with an aluminium oxide content < 98,5% by weight)
Artificial corundum, whether or not chemically defined, with < 50 % of the total weight having a particle size > 10 mm (excl. with aluminium oxide content < 98,5% by weight)