2818 Artificial corundum, whether or not chemically defined, aluminium oxide, aluminium hydroxide

2818 (01/1988-..) Artificial corundum, whether or not chemically defined, aluminium oxide, aluminium hydroxide 28181000 (01/1988-12/1996) Corundum, artificial, whether or not chemically defined 28181010 (01/1997-12/2007) Artificial corundum, whether or not chemically defined, white, pink or ruby, with an aluminium oxide content > 97,5% by weight `high purity` 28181011 (01/2008-..) 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) 28181019 (01/2008-..) 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) 28181090 (01/1997-12/2007) Artificial corundum, whether or not chemically defined (excl. white, pink or ruby, with an aluminium oxide content > 97,5% by weight `high purity`) 28181091 (01/2008-..) 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 `high purity`) 28181099 (01/2008-..) 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 `high purity`) 28182000 (01/1988-..) Aluminium oxide (excl. artificial corundum) 28183000 (01/1988-..) Aluminium hydroxide