| http://www.w3.org/ns/prov#value | - Suitable inert inorganic solids are, in particular, silica, silica gels, clays, aluminosilicates, talcum, zeolites, carbon black, graphite, inorganic oxides, such as silicon dioxide, aluminium oxide, magnesium oxide, titanium dioxide, silicon carbide, preferably silica gels, aluminium oxide, zeolites and carbon black, particularly preferably silica, silica gel and aluminium oxide.
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