Imerys offers wollastonite in a range of particle sizes and aspect ratios as a highly effective functional filler in adhesive and sealant applications. These include structural, high temperature, pressure sensitive, hot melt, heat activated and UV curable adhesives and sealants. Due to the chemistry and acicular structure of wollastonite, it is a mineral reinforcer in these applications, providing improved mechanical properties, sag resistance, rheology, cold temperature crack resistance and tensile strength.
The right wollastonite grade depends on the type of adhesive and sealant, the desired performance criteria, and, if replacing an existing filler, the particle size and attributes of that filler. Imerys high brightness grades for wet-room sealants, fine and coarse powder grades for tile adhesives and grouts and chemically modified high-aspect-ratio grades for moisture sensitive systems and applications requiring excellent peel strength performance.
Most grades are available in chemically modified formulations to enhance mechanical properties and dispersion if required. New product developments include wollastonite grades with very low moisture content and uptake designed specifically for reactive adhesives and sealants based on a range of polymer systems.