Silicon Dioxide (SiO₂) Submicron Fumed Powder

PDMS-treated, Hydrophobic, Size: -325 mesh

Technical Properties

Applications

• Adhesives and Sealants: PDMS-treated fumed silica provides efficient thickening, sag resistance, and anti-settling in epoxy, polyurethane, and silicone-based adhesives. Its hydrophobic nature minimizes moisture uptake, preventing premature curing in moisture-sensitive systems like one-component polyurethanes.
• Coatings and Paints: Used in high-performance coatings, including powder coatings and gel coats, it enhances rheological control, film build, and surface smoothness. It also improves scratch resistance and anti-settling of pigments in solvent-based and waterborne systems.
• Composites and Laminating Resins: In vinyl ester and polyester resin systems, hydrophobic fumed silica offers stable viscosity, shear-thinning behavior, and long-term rheological stability, especially in polar environments. It supports uniform filler dispersion and improved mechanical integrity.
• Electronics and Encapsulation: Its low dielectric constant, thermal stability, and moisture resistance make it suitable for electronic encapsulants, potting compounds, and insulating gels. It helps maintain dimensional stability and electrical insulation under thermal cycling.
• Personal Care and Pharmaceuticals: acts as a free-flow agent, moisture barrier, and viscosity modifier in powders, creams, and gels. Its surface treatment ensures compatibility with hydrophobic carriers and oils.

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