| http://www.w3.org/ns/prov#value | - For example where the material comprises calcium carbonate at least 30%, desirably at least 40%, by weight of the particles of the material may have a size (equivalent spherical diameter as measured by sedimentation) of less than 10 ??m, eg at least 40% by weight may be less than 7??m, especially less than 5 ??m.
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