| http://www.w3.org/ns/prov#value | - The inert additive consists of pulverulent inorganic solid particles, preferably comprising carbonates, in particular of the alkali metal and alkaline earth metals, such as calcium carbonate (chalk), sulfates such as barium sulfate and/or oxides such as inorganic silicon compounds, in particular magnesium silicate (talc), Na/Al silicate, silicon dioxide and glass or titanium dioxide, or mixtures t
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