| http://www.w3.org/ns/prov#value | - With particle sizes which are greater than this range, there is a risk that, at least with thinner coatings, the coating will be unacceptably porous.It is particularly preferred for the ceramic layer to be bonded to the base material over a portion of the former which is spaced inwardly, preferably by not less than 1 mm, from the peripheral edge of the coating.
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