| http://www.w3.org/ns/prov#value | - The initial fiber diameter of wollastonite is, on the average, preferably not less than 2 ??m, more preferably not less than 3 ??m, especially preferably not less than 4 ??m, but preferably not more than 30 ??m, more preferably not more than 20 ??m, especially preferably not more than 15 ??m.
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