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Tetraethyl orthosilicate/TEOS (CAS 78-10-4), with the molecular formula C8H20O4Si, is a colorless, transparent liquid. It is highly volatile at room temperature, readily hydrolyzes upon contact with water, and is miscible with organic solvents such as ethanol. It is neutral in nature and exhibits excellent film-forming, adhesive, and high-temperature resistance properties. It is primarily used as a binder in precision casting, an anti-corrosion additive in coatings, a raw material for organic synthesis, and an auxiliary material in the electronics industry.
| Item | Specification |
| Melting Point | −25°C (lit.) |
| Boiling Point | 136.4°C |
| Density | 1.73 g/mL at 20°C (lit.) |
| Flash Point | 7.8°C (closed cup) |
| Vapor Pressure | 1.33 kPa (21.3°C) |
| Refractive Index | 1.6032 (20°C) |
| Solubility | Reacts violently with water and decomposes; soluble in dilute hydrochloric acid, ethanol, chloroform, carbon tetrachloride, and other organic solvents. |
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