Barium sulfate, commonly used as a radio-opaque filler in medical plastics, has now been precipitated in nano-sized particles of 10 to 50 microns by Solvay Barium Strontium GmbH in Hannover, Germany.
Barium sulfate, commonly used as a radio-opaque filler in medical plastics, has now been precipitated in nano-sized particles of 10 to 50 microns by Solvay Barium Strontium GmbH in Hannover, Germany. Solvay can apply surface treatments that improve both dispersion and resin coupling. Not only do the spherical nano-particles enable filled resins to be clear, but they enhance some mechanical properties better than conventional fillers. For example, just 2.5% of Solvay’s Blanc Fixe Nanofine in epoxy boosts elongation at break by 82% while impact strength rises 73% and tensile strength increases 19%. Tensile and flexural moduli are unaffected, and flexural strength declines 7%. Solvay researchers recommend a maximum of 5% loading in epoxy. It has also been tried in polyurethane and cast acrylic. The filler has a density of around 4 g/cc. Tel: +49 511857 0 • www.solvay-bariumstrontium.com