Hydrophilic Fumed Silica 200 is a high-purity, amorphous silicon dioxide (SiO2) powder produced through the high-temperature hydrolysis of volatile chlorosilanes in an oxyhydrogen flame. Characterized by a specific surface area of approximately 200 m²/g, this versatile nanomaterial is widely recognized for its exceptional rheological control, reinforcing capabilities, and anti-settling properties.

Key Physical and Chemical Properties
This product appears as a highly pure, loose white powder with a low bulk density (approximately 50 g/l) and an average primary particle size ranging from 5 to 40 nm. It is highly hydrophilic, meaning it is easily wetted by water and can be readily dispersed in aqueous systems. Its pH value typically falls between 3.6 and 4.7 in a 4% aqueous dispersion, and its SiO2 content exceeds 99.8%, ensuring excellent chemical stability and high thermal resistance.

Functional Mechanisms
The primary function of Hydrophilic Fumed Silica 200 is to act as a thickener and thixotropic agent. In liquid systems, its surface silanol groups form hydrogen bonds, creating a reversible three-dimensional network structure. This network provides a high yield value at rest, effectively preventing the settling of heavy pigments and fillers, as well as preventing sagging during application. Under high shear forces (such as stirring or brushing), the network breaks down, lowering viscosity for easy processing, and rapidly rebuilds once the shear is removed.

Diverse Industrial Applications
Thanks to its balanced performance, Hydrophilic Fumed Silica 200 is utilized across multiple industries:
Paints & Coatings: Acts as an anti-settling, thickening, and anti-sagging agent in solvent-based and water-based systems.
Adhesives & Sealants: Enhances structural strength and prevents flow in vertical applications.
Silicone Elastomers: Serves as a highly effective reinforcing filler for High-Temperature Vulcanizing (HTV) and Room-Temperature Vulcanizing (RTV-2K) silicone rubbers, improving mechanical strength and transparency.
Printing Inks: Controls viscosity and improves pigment suspension.
Powders & Cosmetics: Functions as a free-flow and anti-caking agent, as well as a thickening carrier in personal care products.

Overall, Hydrophilic Fumed Silica 200 is an indispensable functional additive that significantly enhances the stability, processability, and final performance of advanced industrial formulations.