| http://www.w3.org/ns/prov#value | - Multilayer systems, in which in each component at least 90% by volume of the particles are <50 ??m and more than 10% by volume of the particles are ???20 ??m and the mean particle size is in the range of from 15 to 35 ??m, e.g. 20 to 30 ??m, such as substantially 25 ??m, should be mentioned.
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