Chemical & Material
Tetraethyl Orthosilicate
Tetraethyl orthosilicate (TEOS) is the chemical compound with the formula Si(OC2H5)4. Often abbreviated TEOS, it is a colorless liquid that degrades in water. TEOS is the ethyl ester of orthosilicic acid, Si(OH)4. TEOS is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry and as the silica source for synthesis of zeolites.
- Types
- Direct Method · STC Method
- Applications
- Silicone rubber · High-purity silica · Vitrified bond
5 editions2 January 2026