Aerosil 200 Colloidal silica Evonik Original 10kg bag

Colloidal Silicate "Aerosil 200"
Other Names: Hydrophilic fumed silica, Pyrogenic silica

CAS Number: 112945-52-5 (amorphous silicon dioxide)
Sum Formula: SiO₂
Molar Mass: 60.08 g/mol
Appearance: Very light, "fluffy" fine white dust

Aerosil 200 is a high-purity, hydrophilic, fumed (pyrogenic) silica produced by the flame hydrolysis of silicon tetrachloride. It has a specific surface area of approximately 200 m²/g (BET method) and is widely used as a thickening agent, reinforcing filler, flow aid, and anti-caking agent in various industrial applications.

Chemical and Physical Properties
Specific Surface Area: ~200 m²/g (BET)
Bulk Density: ~50 g/L (according to DIN EN ISO 787/11, August 1983)
Particle Size (primary particles): ~12 nm (average)
Density (true): 2.2 g/cm³
Melting Point: >1700°C
Boiling Point: Not applicable (solid at all practical conditions)
Solubility in Water: Insoluble
Solubility in Other Solvents: Insoluble
Odor: Odorless

Applications
Industrial Formulations: Used to control rheology (viscosity) in adhesives, coatings, and sealants.
Plastics and Composites: Acts as a reinforcing filler improving mechanical properties and processability.
Paints and Inks: Serves as a thickening and anti-sagging agent.
Cosmetics: Utilized as a free-flow and anti-caking agent in powders and emulsions.
Pharmaceutical and Technical Applications: Studied for surface modification and as a carrier in solid dispersions and delivery systems.

Safety

Signal Word: Warning

Handling and Storage
Storage Conditions: Store in a tightly closed container in a cool, dry, and well-ventilated area. Protect from moisture and strong oxidizing agents.
Handling Precautions: Handle gently to minimize dust formation. Use appropriate PPE including dust masks or respirators and eye protection.