Sourcing Aerosil 200 (Fumed Silica)? ChemicalDekho connects you with authorized distributors of Evonik and specialized domestic producers. Access the world's most versatile rheology modifier for paints, resins, and pharmaceuticals.
Aerosil (CAS 112945-52-5) is produced by flame hydrolysis, resulting in incredibly small particles with high surface area. It is the gold standard for providing 'Thixotropy' to liquid resins—making them thick while standing but easy to spread when stirred. In the pharma industry, it is a critical glidant to ensure smooth powder flow during tableting. Listings cover standard 200 mesh hydrophilic grades and specialized hydrophobic versions.
Verified listings ensure low moisture content and consistent surface area (m2/g), critical for predictable thickening performance.
Anti-settling & Thickening
Thixotropy in fiberglass resins
Glidant for tablet manufacturing
Matting agent & thickener
Sag resistance in sealants
Ink rheology control
Reinforcing filler
Dry powder extinguishers
Leading petrochemical producers
Ready stock at Ports
Compliant transport
Relatively non-toxic but very dusty. Chronic inhalation of dust may cause lung damage (Silicosis risk if crystalline). Amorphous fumed silica is safer but PPE is mandatory.
It is the property of a fluid to become thin when stirred and thick when standing. Aerosil creates this in resins, stopping paint from dripping off the wall while still being easy to brush.
They are both brands of Fumed Silica. Aerosil is made by Evonik (Germany), and Cab-O-Sil is made by Cabot (USA). They are chemically identical.
Fumed silica is extremely low density—it is 90% air! A 10kg bag is the size of a standard 50kg cement bag.
Yes, Food Grade fumed silica (E551) is used as an anti-caking agent in salt, creamer, and spices to keep them flowable.