Molekula
Tetraethoxysilane
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · 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 at > 99 % purity in 100 g and 500 g packs, from £35.40 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
In stock — same-day dispatch
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.
-
100 g — £29.50 per pack ex VAT · £35.40 inc. VAT
-
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
-
Flammable
GHS02
-
Health Hazard
GHS07
-
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
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.
Where can I buy Tetraethoxysilane?
Directly from Molekula, which lists Tetraethoxysilane in 100 g and 500 g packs from £35.40 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Is Tetraethoxysilane dangerous goods for shipping?
Yes. Tetraethoxysilane ships as dangerous goods: UN1292, class 3, packing group III.
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.