- beauty
- cleaning
- industrial
Tetraethyl orthosilicate
CAS 827300-06-1
Also registered as 3 other CAS numbers
1239977-99-1 · 1421840-08-5 · 78-10-4
Concern score
Not assessed — no hazard data yet.
Tetraethyl orthosilicate in plain language
Also known as Ethyl silicate · Teos · Tetraethyl silicate · Tetraethoxysilane · Tetraethyl ester silicic acid · Silikan l
Show all 27 names
Conservare OH · Dynasil A · ES 28 (ester) · Ethyl Silicate 45 · Ethyl Silicate,Silicic acid (H4SiO4), tetraethyl ester,TEOS · Ethyl orthosilicate · Ethyl silicate 28 · Ethyl silicate 28P · Ethyl silicate PHASE · Ethyl silicate, ((EtO)4Si) · Etylu krzemian · Silane, tetraethoxy- · Silicate d'ethyle · Silicate tetraethylique · Silicic acid (H4SiO4), tetraethyl ester · Silicon ethoxide · Silicon tetraethoxide · Tetraethoxysilicon · Tetraethylorthosilicate · Tetraethylsilikat · ethyl silicate (tetraethyl orthosilicate)
Used in cosmetics as a thickener.
- Thickener
- We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.
Regulation
No restrictions found. Tetraethyl orthosilicate appears in these published regulatory listings.
- Found in consumer products
- Beauty
- Cleaning
- Industrial
EUCosIngActiveTetraethyl Orthosilicate is the organic compound that conforms to the formula:
- Tetraethyl Orthosilicate is the organic compound that conforms to the formula:Source →
USEPAcommercial use observedEPA CPDat observed this chemical in 236 composition records across product categories including Raw materials, Home maintenance, Industrial products. EPA CPDat classifies this chemical for functional uses including No specific technical function, Chemical reaction regulator, silicon-based monomers.
- EPA CPDat observed this chemical in 236 composition records across product categories including Raw materials, Home maintenance, Industrial products. EPA CPDat classifies this chemical for functional uses including No specific technical function, Chemical reaction regulator, silicon-based monomers.Source →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
- openFDA substance registry classifies this ingredient as chemical.Source →
Expert safety opinions
No expert opinion on file for Tetraethyl orthosilicate. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.
SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.
Evidence & sources
No graded research studies for Tetraethyl orthosilicate yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Where this comes from
- Open →
CosIng
regulatory · updated 2026-09-23
- Open →
EPA Chemical and Products Database
exposure · updated nov 11 1997
- Open →
EPA DSSTox Identifiers
chemistry · updated 2025-12-29
- Open →
FDA GSRS UNII
registry · updated 2026-02-26
- Open →
openFDA Substance
registry · updated 2026-05-24
- Open →
PubChem Live Enrichment
chemistry · updated 2026-05-17
Reference links (1)
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Fragrance avoidance
Nothing to weigh for this context yet.
We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.
Where it has been recorded
How often EPA CPDat has listed Tetraethyl orthosilicate in a product composition. These are source records, not Greenveil catalog products.
Source records
236
Named organisations
5
Raw materialsHome maintenanceIndustrial productsVehicleLaboratory suppliesPersonal care
Typical roles
Thickener