Sintered corundum with a micro crystalline structure, consisting of aluminium oxide (CAS|RN|1344-28-1), magnesium aluminate (CAS|RN|12068-51-8) and the rare earth aluminates of yttrium, lanthanum, and neodymium, with a content by weight (calculated as oxides) of:
 
-|92|% or more, but less than 98,5|% of aluminium oxide,
 
-|2|% (± 1,5|%) of magnesium oxide,
 
-|1|% (± 0,6|%) of yttrium oxide,
and
 
-|either 3|% (± 2,2|%) of lanthanum oxide or
 
-|2|% (± 1,2|%) of lanthanum oxide and neodymium oxide,
with less than 50|% of the total weight having a particle size of more than 10|mm
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condition:Y,certificate:Y966,action:29|condition:Y,action:09