What Is Precipitated Silica?

Precipitated silica is a white, amorphous form of silicon dioxide (SiO₂) produced by reacting sodium silicate with sulfuric acid under controlled conditions-
. The resulting powder features a high surface area, adjustable porosity, and fine particle size-all of which influence its reinforcing ability in rubber and other materials-
.
Key characteristics include:
• High surface area (typically 150–250 m²/g for rubber grades)-
• Excellent purity with minimum 98% SiO₂ content-
• Controlled pH (6.0–7.5)-
• Adjustable oil absorption capacity-
• Porous structure with customizable particle size-
Precipitated silica is widely used as a reinforcing filler to enhance the wear resistance and mechanical strength of tires and seals; in coatings, paints, and inks as an anti-settling agent and thickener; and in the food and pharmaceutical sectors as an anti-caking agent or carrier-

Its performance can be tailored through particle size, specific surface area, and surface modification to meet diverse industrial requirements-

Understanding these fundamental properties helps in selecting the right silica grade for specific applications-whether for tire reinforcement, food-grade anti-caking, or specialty coatings.