| http://www.w3.org/ns/prov#value | - As examples can be mentioned clays (the plate-like hydrous aluminium silicate particles which range in size from colloidal to 4 microns), cement (the particles of Portland cement are ground to sizes mostly below 10 microns), paint pigments (titanium dioxide may be used in particles about 0.3 microns in diameter), as well as dusts, such as coal dusts and asbestos.
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