| http://www.w3.org/ns/prov#value | - Silica particles, i.e. porous silicon dioxide particles formed from amorphous SiO2, are used in several applications, for example as catalysts, catalyst carriers, as packing material in chromatography equipment, as ion exchangers etc, and in the different applications there are different requirements on, for example, the purity of the particles, their alkali metal content, the size, pore character
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