Product Name: Ethyl Polysilicate (Ethyl Silicate‑40)
IUPAC Name: Silicic acid, ethyl ester
Synonyms: Polyethyl silicate, Ethyl silicate 40, ES‑40, Si‑40
CAS No.: 11099‑06‑2
EC / EINECS: 234‑324‑0
Note: Oligomeric mixture (not single monomer), partial hydrolysis‑condensation product of Tetraethyl Orthosilicate (TEOS‑28, CAS 78‑10‑4)
UN‑No: UN 1292, Hazard Class 3, Packing Group III (Flammable liquid)HS‑Code: 38249999
1. Physical‑Chemical Properties
Flash Point (closed cup) ≥38 ℃
Boiling range Wide boiling range >200 ℃ (oligomer mixture, partial decomposition)
Solubility Miscible with ethanol, isopropanol, toluene, xylene; reacts & hydrolyses with water/moisture, releases ethanol
Stability Stable under anhydrous sealed condition; sensitive to moisture; hydrolysis accelerated by acid / base catalyst
Average molecular weight ~600‑700
2. Typical Specifications (Industrial Grade Ethyl Silicate‑40)
| Item | Specification | Test Condition |
|---|---|---|
| Appearance | Colorless to pale yellow transparent liquid | Visual @25 ℃ |
| Colour (APHA) | ≤50 | Colorimeter |
| SiO₂ Content | 40.0‑42.0 % | Gravimetric method |
| Density | 1.04‑1.07 g/cm³ | 20 ℃ |
| Viscosity | 3‑8 mPa·s | Brookfield @25 ℃ |
| Refractive Index nD20 | 1.390‑1.405 | 20 ℃ |
| Water Content | ≤0.10 % | Karl‑Fischer |
| Acidity (as HCl) | ≤0.001 % | Titration |
3. Key Properties
Oligomeric ethoxysiloxane mixture, higher silica content than monomer TEOS‑28.
Sol‑gel precursor, hydrolyse‑condense to form continuous silica film upon contact with moisture.
Excellent binding strength for inorganic fillers, pigments, metal surfaces.
Lower ethanol release per unit silica compared to TEOS monomer.
4. Main Applications
Zinc‑rich anti‑corrosive paint: Main binder for inorganic zinc‑rich coating (largest application)
Precision investment‑casting: ceramic shell binder
Sol‑gel raw‑material: silica film, hard coating, stone consolidant for building & cultural relic protection
Cross‑linking agent for silicone, surface treatment for glass, metal and inorganic powder
Heat‑resistant coating, inorganic coating raw‑material
5. Storage & Shelf‑Life
Storage: Hermetically sealed, cool dry well‑ventilated warehouse, temperature 5‑30 ℃. Strictly prevent moisture ingress, keep away from flame, heat source, acids, alkalis and oxidants.
Shelf‑life: 12 months for unopened original drum.
Standard export packing: 200 kg steel drum; 1000 L IBC tote tank.
6. Handling & Safety Notes
Flammable liquid; vapour can form explosive mixture with air.
Irritant to eyes, skin and respiratory tract. Wear chemical goggles, resistant gloves, organic vapour respirator.
Avoid any water entering storage containers to prevent premature hydrolysis & gelation.
In case eye/skin contact, rinse with plenty running water for minimum 15 min.
Refer to full SDS for GHS hazard statements, transport classification and waste disposal information.Disclaimer: All figures are typical laboratory reference values only, not contractual specification. End‑user shall verify suitability for own process.
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