| http://www.w3.org/ns/prov#value | - A D90 of solid washcoat particles in this first, surface coating embodiment can be greater than the mean pore size of the porous filter substrate and can be in the range 10 to 40 ??m, such as 15 to 30 ??m or 12 to 25 ??m. ???D90??? as used herein defines the particle size distribution in a washcoat wherein 90% of the particles present have a diameter within the range specified.
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