TETRAETHYL ORTHOSILICATE- ▸ Stone/masonry consolidant: Weatherproofs and hardens stone, brick, concrete and plaster.
- ▸ Investment casting binder: Bonds shell molds for casting high-melting alloys.
- ▸ Heat/acid-resistant coatings: Base for chemical- and heat-resistant paints, mortars and cements.
- ▸ Silica precursor: Source of SiO2 for sol-gel, ceramic and semiconductor processing.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.
Tetraethyl orthosilicate (TEOS, CAS 78-10-4) is the tetraethyl ester of silicic acid and a primary source of silicon dioxide via hydrolysis and the sol-gel process. It is used to weatherproof and consolidate stone, brick, concrete and plaster, and to formulate heat- and acid-resistant coatings, mortars and cements. It also serves as a binder in precision investment ('lost-wax') casting of high-melting alloys and in ceramic and semiconductor processing.
Frequently Asked Questions
What is tetraethyl orthosilicate used for?
TEOS (CAS 78-10-4) is used to weatherproof and consolidate stone, brick, concrete, and plaster; as a binder in precision investment (lost-wax) casting of high-melting alloys; in heat- and acid-resistant coatings, mortars, and cements; and as a silica (SiO2) precursor for sol-gel, ceramic, and semiconductor processing.
Is tetraethoxysilane the same as tetraethyl orthosilicate?
Yes. Tetraethoxysilane, tetraethyl orthosilicate, TEOS, and ethyl silicate all refer to the same compound, C8H20O4Si (CAS 78-10-4), the tetraethyl ester of silicic acid.
What is an example of an orthosilicate?
TEOS itself is an orthosilicate ester, the tetraethyl ester of orthosilicic acid. It hydrolyzes to release silicon dioxide, which makes it a primary silica source in the sol-gel process.
How does TEOS ship under DOT?
TEOS is assigned UN 1292 (ETHYL SILICATE), a flammable liquid. Confirm the packing group, packaging, and documentation against the current SDS before shipping.
What is the cost of bulk TEOS?
Bulk TEOS pricing depends on volume and packaging. Request a quote from RawSource with your target quantity; it ships in drums and totes with CoA and SDS available on request.