Vansil W-30 Calcium metasilicate 13983-17-0 R. T. Vanderbilt Extenders / Fillers >> Calcium silicate ADHESIVE >> Water-based SEALANT VANSIL ® W-30 Wollastonite (calcium metasilicate) Uses - Functional filler in adhesives, abrasives, ceramics, elastomers, insulating materials, paint, plastics, resins, sealants, and wallboards. Wollastonite. Used as a functional filler in adhesives and sealants.