Fumed Silica, Pyrogenic silica, Colloidal Silica, Silica Fume, Aerosil R202, Aerosil R200, Cabosil M5, Xysil 200, 67762-90-7

Fumed Silica, Pyrogenic silica, Colloidal Silica, Silica Fume, Aerosil R202, Aerosil R200, Cabosil M5, Xysil 200, 67762-90-7

Fumed Silica (CAS No: 67762-90-7)

Fumed silica, also known as pyrogenic silica, is a very fine, high-purity silica powder.

• Production: Obtained by flame hydrolysis of silicon tetrachloride or by vaporizing quartz sand in a 3000 °C electric arc.

• Key Property: Extremely small particles with a large surface area, making it an excellent thickener and anti-caking agent.

Applications

• Cosmetics: Improves texture and stability.

• Paints & coatings: Increases viscosity, prevents sagging.

• Adhesives & sealants: Enhances mechanical properties and stability.

• Pharmaceuticals: Acts as a glidant to improve powder flow.

Other Names

• Pyrogenic silica

• Colloidal silica

• Silica fume

• AEROSIL (Evonik brand name)

AEROSIL R 202 (PDMS-treated fumed silica)

AEROSIL R 202 is a fumed silica surface-treated with polydimethylsiloxane (PDMS).

Key Features

• Hydrophobicity: Silicone oil treatment ensures strong water repellence.

• Thickening & Thixotropy: Highly efficient in epoxy, polyurethane, and vinyl ester resins.

• Moisture resistance: Improves water resistance in sensitive cosmetic formulations.

• Pigment stabilization: Prevents sedimentation and sagging in 2-C epoxy coatings.

• Electrical properties: Excellent insulation and low water absorption; enhances tribo charge in toner particles.

• Flowability: PDMS-treated grades provide good powder flow.

Typical Applications

• Adhesives & sealants for fiber optic cables

• Epoxy & vinyl ester resins, gelcoats

• Cable gels, lubricants, cosmetic formulations

• Foam control formulations (reinforcing silica)

• Anti-settling aid for fillers (chalk, quartz)

• Corrosion protection systems

• Toner particles (charge control & flow improvement)

In short:

• Fumed silica → high-purity, fine silica with broad use as thickener and flow aid.

• AEROSIL R 202 → PDMS-treated, hydrophobic grade with superior performance in resins, cosmetics, and toner applications.