Molekula
Tetraethoxysilane
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Tetraethoxysilane is a silicon-based precursor used in sol-gel processes, coatings, and the synthesis of silica materials. It is a colorless liquid that hydrolyzes readily in moisture. It is also used to consolidate and weatherproof stone and masonry, in heat- and chemical-resistant paints, in investment casting of high-melting alloys, and for silicon dioxide deposition in semiconductor manufacturing. CAS: 78-10-4, molecular formula: Si(OC₂H₅)₄, molecular weight: 208.33 g/mol, stored at ambient temperature. Signal word: Warning. Molekula supplies Tetraethoxysilane from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £29.50 per pack ex VAT · £35.40 inc. VAT
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500 g — £62.10 per pack ex VAT · £74.52 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Clear colourless liquid |
| Assay | > 99 % |
| Ethanol (G.C.) | < 0,2 % |
| HCI content by titration | < 2 ppm |
| Hydrolysable Chloride | < 1 mg/Kg |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 45 °C |
| Transport Class | 3 |
| Packing Group | III |
| Acidity | Neutral |
For research use only. Not for human use.
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless liquid |
| Odour | Sharp, ester-like odor |
| Melting Point | -82.5 °C |
| Boiling Point | 168.8 °C |
| Density | 0.93 (relative, water = 1) |
| Solubility (other solvents) | Soluble in ether |
| Vapour Pressure | 200 Pa at 20 °C |
| Refractive Index | 1.3818 |
Source: PubChem CID 6517 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 44868174 |
| CAS Number | 78-10-4 |
| IUPAC Name | tetraethyl silicate |
| EC Number | 201-083-8 |
| Molecular Formula | Si(OC2H5)4 |
| Molecular Weight | 208.33 |
| Exact Mass | 208.1131 |
| SMILES | CCO[Si](OCC)(OCC)OCC |
| InChIKey | BOTDANWDWHJENH-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3 |
| PubChem CID | 6517 |
| UN Number | UN1292 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2920.90.5100 |
| Tariff Code | 2920907090 |
Safety & GHS
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Flammable
GHS02
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H226 Flammable liquid and vapour
- H319 Causes serious eye irritation
- H332 Harmful if inhaled
- H335 May cause respiratory irritation
- H373 May cause damage to organs through prolonged or repeated exposure
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Dynasil A
- Ethyl orthosilicate
- ETHYL SILICATE
- Silicon ethoxide
- Silicon tetraethoxide
- Silikan L
- TEOS
- Tetraethoxysilicon
- Tetraethyl orthosilicate
- Tetraethyl silicate
Frequently asked questions
What is tetraethoxysilane used for?
Tetraethoxysilane is primarily used as a precursor in the synthesis of silica-based materials, including coatings, ceramics, and sol-gel processes.
What is the chemical formula and molecular weight of tetraethoxysilane?
The formula is Si(OC2H5)4 and the molecular weight is 208.33 g/mol.
How should tetraethoxysilane be stored?
It should be stored at ambient temperature, away from moisture and incompatible materials.
What grade of tetraethoxysilane does Molekula supply?
Molekula supplies tetraethoxysilane in high-purity grade suitable for laboratory and industrial applications.
Can Molekula supply tetraethoxysilane in bulk?
Yes, Molekula can supply tetraethoxysilane in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a tetraethoxysilane order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.