Vansil HR325 Calcium metasilicate R. T. Vanderbilt Extenders / Fillers >> Calcium silicate Epoxy (EP) Aminoplaste & Phenoplastes (UF, MUF...) ADHESIVE SEALANT Functional filler in abrasives, adhesives, ceramics, elastomers, insulating materials, paint, plastics, resins, sealants and wallboards. Also used in phenolic and bulk molding compounds, as well as in epoxy potting compounds.Because VANSIL tends to agglomerate during prolonged storage, we recommend a maximum storage period of 6 months. Most VANSIL products are available in silane treated forms under the VANCOTE trade name. VANSIL ® HR325 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.