VANSIL® WG Wollastonite

VANSIL® WG Wollastonite is a high aspect ratio, long needle grade of wollastonite. It is used principally as a mineral filler and reinforcing agent to enhance mechanical strength properties in high build coatings, texture paint, and block fillers. In high film build coatings, the needle-like shape of VANSIL WG improves mud crack resistance and sag resistance, while also contributing to peak retention in texture coatings. The naturally high pH of wollastonite helps to buffer latex paints and coatings, which contributes to improved corrosion resistance and weathering. This also extends in-can stability and prolongs the lifetime of the coating. In calcium silicate board and fiber cement, VANSIL WG increases flexural and compressive strength, reduces shrinkage, and reduces cracking. It is recommended that high aspect ratio grades of VANSIL be added late in process to avoid possible damage to the needle structure from high shear mixing.