SUNOIT Fumed Silica: Ultra-Pure Reinforcing and Thixotropic Functional Filler

Fumed silica is an ultra-fine amorphous silicon dioxide produced by high-temperature hydrolysis of volatile chlorosilanes in a hydrogen-oxygen flame. With primary particle sizes down to the nanometer scale and specific surface areas ranging from 130 to 400 m²/g, its abundant reactive surface silanol groups deliver excellent reinforcement, thickening, thixotropy, and anti-settling properties.

In silicones, fumed silica is the essential reinforcing filler for silicone rubber, significantly improving tensile strength, tear resistance, and clarity. In coatings, inks, and adhesives, it precisely controls rheology, prevents pigment settling, and provides sag resistance at high film builds. Across composites, cosmetics, and food additives, it contributes free flow, anti-caking, and matting functions.

SUNOIT supplies both hydrophilic and hydrophobic fumed silica grades. With consistent high purity and flexible packaging options, we support the liquid silicone rubber, high-consistency rubber, sealant, coatings, and new energy sectors with high-performance nano-filler solutions that elevate product formulations.