| http://www.w3.org/ns/prov#value | - The thickness of the catalytically active oxide material applied as a coat to the annular support is very generally from 10 to 1000 ??m, very preferably from 50 to 500 ??m, particularly preferably from 100 to 500 ??m, very particularly preferably from 150 to 250 ??m.
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