Tetraethyl orthosilicate
Also known as: TEOS, Tetraethoxysilane, Ethyl silicate, Ethyl orthosilicate, Silicon tetraethoxide, Orthosilicic acid tetraethyl ester, Silane, tetraethoxy-, Tetraethyl silicate
Tetraethyl orthosilicate (CAS 78-10-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H20O4Si and a molecular weight of 208.327 g/mol. Key properties include a melting point of -77 °C, a boiling point of 165.5±0.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of 46.7±0.0 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour, H319 — Causes serious eye irritation and H332 — Harmful if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 78-10-4
- Jingsj CID
- J-1354547-6
- Molecular Formula
- C8H20O4Si
- Molecular Weight
- 208.327 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -77 °C |
|---|---|
| Boiling Point | 165.5±0.0 °C at 760 mmHg |
| Density | 0.9±0.1 g/cm3 |
| Flash Point | 46.7±0.0 °C |
| Exact Mass | 208.113083 |
| PSA | 36.92000 |
| LogP | 5.10 |
| Additional Property | 7.2 (vs air) |
| Vapor Pressure | 2.5±0.3 mmHg at 25°C |
| Refractive Index | 1.409 |
| Additional Property | Hydrolysis |
| Additional Property | -77℃ |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H319 — Causes serious eye irritation
- H332 — Harmful if inhaled
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2920909090 |
|---|---|
| Summary | 2920909090 esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Tetraethyl orthosilicate?
The CAS number of Tetraethyl orthosilicate is 78-10-4.
What are the molecular formula and molecular weight of Tetraethyl orthosilicate?
Tetraethyl orthosilicate has molecular formula C8H20O4Si and molecular weight 208.327 g/mol.
Is Tetraethyl orthosilicate hazardous?
Tetraethyl orthosilicate has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour; H319 — Causes serious eye irritation; H332 — Harmful if inhaled.
What are the upstream and downstream products of Tetraethyl orthosilicate?
For Tetraethyl orthosilicate, Upstream Products: Ethanol, Silicon, Triethoxysilane; Downstream Products: 2-Butene, 1,1-diethoxy-, Triethoxyfluorosilane, Tetrabutyl orthosilicate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Tetraethyl orthosilicate (CAS 78-10-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1354547-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.