| http://www.w3.org/ns/prov#value | - Properly sized silicon dioxide compositions with nominal particle sizes of 16 m?? are commercially available normally, for convenience, in the form of sols and gels, such as the material marketed under the trademark Syton by the Monsanto Company, Ludox (a silica sol) by DuPont and Quso (a microcrystalline silica) by Philadelphia Quartz Co.
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