Casting compsn. for making white mouldings consists of (a) a curable syrup contg. a liquid monomer and opt. prepolymer fraction dissolved in this and (b) an inorganic filler comprising a quartz sand prod. (I), in which the individual grains have a core of quartz and a surface of alpha -cristobalite (II). Also claimed are moulding made from the compsn..
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