Sintered corundum with a micro crystalline structure, consisting of aluminium oxide (CAS RN 1344-28-1) and magnesium aluminate (CAS RN 12068-51-8), with a content by weight (calculated as oxides) of:
 
-92 % or more, but not more than 94 % of aluminium oxide, and
 
-8 % (± 1 %) of magnesium oxide

Import prohibition