Better Performance with Silicone Materials
Fumed Silica Guide
Discover how fumed silica improves anti-settling, rheology, and anti-sag performance in paints and coatings formulations.
Discover why fumed silica is the key reinforcing filler in silicone rubber, enhancing strength, rheology, and durability in RTV, HTV, and LSR systems.
Discover how fumed silica improves coating rheology, viscosity control, anti-sag performance, and storage stability in industrial paint formulations.
Compare hydrophilic vs hydrophobic fumed silica. Learn properties, applications, and how to choose the right silica for coatings, silicone and resins.
Explore fumed silica properties, structure, and industrial uses in silicone rubber, coatings, and sealants. Learn how to choose the right grade.
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Frequently Asked Questions
What is fumed silica and what is it used for?
Fumed silica is a high-purity, fine-particle silica used primarily as a rheology modifier, thickener, anti-settling agent, and reinforcing filler. It is widely used in silicone rubber, adhesives, sealants, coatings, inks, composites, and other industrial formulations.
What is the difference between hydrophilic and hydrophobic fumed silica?
Hydrophilic fumed silica has a water-attracting surface and is commonly used for thickening and rheology control in suitable formulations. Hydrophobic fumed silica is surface-treated to reduce water affinity, improving compatibility with non-polar or moisture-sensitive systems and often providing better processing and viscosity stability.
What are the main applications of fumed silica?
Fumed silica is widely used in silicone rubber, silicone sealants, adhesives, coatings, composites, inks, greases, and other industrial formulations. Depending on its surface chemistry and grade, it can provide viscosity control, thixotropy, anti-settling, reinforcement, sag resistance, and improved mechanical properties.
How do I choose the right fumed silica for my application?
Select fumed silica based on surface chemistry, specific surface area, structure, compatibility, required rheology, reinforcement level, processing method, and end-use requirements. Hydrophilic and hydrophobic grades can provide different performance depending on the formulation and application.
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