Fumed silica (also known as pyrogenic silica or silicon dioxide) is one of the lightest known materials in the world. It can be produced using various methods, which determine whether it is hydrophilic or hydrophobic. One of the primary production methods involves burning fine amorphous silica particles at high temperatures. Applications Across Industries Fumed silica is widely used in coatings, resins, concrete, adhesives, cosmetics, and personal care products. In polymer systems, it serves as a filler and provides several key benefits, including: Improved particle dispersion Anti-settling and anti-foaming properties Sag resistance Matting effect Enhanced flowability Increased thixotropic behavior (thixotropy refers to a material becoming more fluid when subjected to shear force and thickening again when at rest) Overall enhancement of rheological properties Specific Uses Used as a mild abrasive in toothpaste Adds elasticity to bitumen-based systems Functions as a catalyst carrier in catalytic processes Surface Area Classification Fumed silica is categorized based on specific surface area. One of the most commonly used grades is Fumed Silica 200, which has a specific surface area of 200 m²/g, meaning 1 gram of this material can cover a surface area of 200 square meters. Safety Precautions Due to its extremely fine particle size and potential to enter the respiratory system, proper safety measures must be followed during handling.