| http://www.w3.org/ns/prov#value | - No. 462,365, sub-micron particle size silicas made by either of two different processes (i.e. either fumed silica made by hydrolysis of silicon tetrachloride vapor in a hydrogen/oxygen flame or precipitated silica made from an alkaline silicate such as sodium silicate that is precipitated with a mineral acid or metal salt) may be used in the powder mix.
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