Polywate 325 Baryum sulfate Cimbar Extenders / Fillers >> Barium Sulfates SEALANT ADHESIVE Polywate - products are made from a lower density but intermediate brightness ore. While not nearly as bright as the CIMBAR grades, they are quite usable in most off-white and pastel applications. Like the BARA products, they are only available in 325 mesh size. Applications include brake pads, sound deadening, urethane & pvc foams, sealants, rubber compounds, etc. This group of naturally occurring products is unbleached and ground in a unique combination of medium and fine grind particle sizes providing high specific gravity, low solubility, and chemical inertness. These products, originally manufactured for the reinforced urethane and filled foam markets, can be used quite successfully in acoustical compounds, mold release agents and mold wash, filled rubber and plastics, adhesives, coatings, and sealants. Barium sulfate. Used as filler in adhesives and sealants. Provides high specific gravity, low solubility, and chemical inertness.