Product Name: Tetraethyl Orthosilicate
Synonyms: Tetraethoxysilane, TEOS, Ethyl Silicate‑28, Silicon Tetraethoxide
CAS No.: 78‑10‑4EC Number: 201‑083‑8
Molecular Formula: C8H20O4Si
Molecular Weight: 208.33 g/mo
UN‑No: UN 1292, Hazard Class 3, Packing Group III (Flammable liquid)
HS‑Code: 29209099
1. Typical Specifications (Industrial Grade TEOS‑28)
| Item | Specification | Test Condition |
|---|---|---|
| Appearance | Colorless transparent liquid | Visual @25 ℃ |
| Colour (APHA) | ≤30 | Colorimeter |
| Purity (Tetraethyl Orthosilicate) | ≥98.5 % | GC‑FID |
| SiO₂ Equivalent Content | 28.4‑28.8 % | Gravimetric analysis |
| Water Content | ≤0.10 % | Karl‑Fischer |
| Acidity (as HCl) | ≤0.0005 % (5 ppm) | Titration |
| Refractive Index nD20 | 1.381‑1.384 | 20 ℃ |
| Density | 0.930‑0.936 g/cm³ | 20 ℃ |
2. Physical‑Chemical Properties
Melting Point −77 ℃
Boiling Point 165‑169 ℃ @760 mmHg
Flash Point (closed cup) 46‑49 ℃Auto‑ignition Temperature 220 ℃
Viscosity ~0.7 mPa·s @25 ℃
Vapor Pressure 1 hPa @20 ℃
Solubility in Water Practically insoluble; hydrolyses upon contact with water/moisture to ethanol & silicic acid
Solubility in organics Miscible with ethanol, ether, ketones, aromatic solvents
Stability Stable under anhydrous condition; sensitive to moisture; avoid strong acids / bases
3. Key Properties
Tetra‑functional alkoxysilane precursor; undergoes sol‑gel hydrolysis‑condensation in presence of water & catalyst (acid/base) to form silica network, releasing ethanolSigma-Aldr....
Low‑viscosity liquid; good compatibility with many organic solvents.Hydrolysis rate controlled by water dosage, pH and temperature.
4. Main Applications
Investment casting: Binder for precision casting ceramic shell (major usage)
Coating industry: Heat‑resistant coating, anti‑corrosive silicate coating, sol‑gel optical coating, hard coating precursor
Silicone industry: Cross‑linking agent for RTV condensation cure silicone rubber & sealants
Material synthesis: Precursor for silica powder, aerogel, silica‑based composite materials, Stöber silica nanoparticlesSigma-Aldr...
Surface treatment agent for glass, metal and inorganic fillers
5. Storage & Shelf‑Life
Storage: Hermetically sealed, cool dry well‑ventilated warehouse; temperature 5‑30 ℃. Strictly avoid moisture, water ingress. Keep away from heat source, open flame, oxidizing agents, acids & alkalis.
Shelf‑life: 12 months under unopened original packing.
Standard export packing: 180 kg HDPE steel drum; 1000 L IBC tote tank.
6. Handling & Safety Notes
Flammable liquid; vapour may form explosive mixture with air.
Irritant to eyes, respiratory tract and skin. Wear chemical‑resistant gloves, goggles, organic vapour respirator for handling.
In case eye/skin contact, rinse thoroughly with plenty running water.
Prevent any water entering storage container to avoid premature hydrolysis.
Refer to complete SDS for full GHS hazard statements, transport classification and waste disposal information.Disclaimer: All values are typical laboratory reference data only, not contractual specification. End‑user shall verify suitability for own process.
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