Tetraethyl orthosilicate
Synonyms: SILICON TETRAETHOXIDE;TEOS;TETRAETHOXYSILANE;TETRAETHYL SILICATE;TETRAETHYL ORTHOSILICATE;ORTHOSILICIC ACID TETRAETHYL ESTER;ETHYL-O-SILICATE;ETHYL ORTHOSILICATE
CAS: 78-10-4
MF: C8H20O4Si
MW: 208.33
EINECS: 201-083-8
Melting point -77 °C
Boiling point 168 °C(lit.)
density 0.933 g/mL at 20 °C(lit.)
vapor density 7.2 (vs air)
vapor pressure <1 mm Hg ( 20 °C)
refractive index n20/D 1.382(lit.)
Fp 116 °F
storage temp. Flammables area
solubility Soluble in ethanol and 2-propanol.
Water Solubility Hydrolysis
FreezingPoint -77℃
Sensitive Moisture Sensitive
Merck 14,3851
Chemical Properties Colorless, flammable liquid with a pungent odor. Insoluble in water, soluble in alcohol, slightly soluble in benzene.
Uses 1. Tetraethyl orthosilicate is Used as insulating materials in electronic industry, also used for optical glass processing and used as coagulants.
2. For precision casting, as a sand binder. Metal surface treated by ethyl silicate vapor can be anticorrosion and waterproof. Ethyl silicate can be used to bleed on the metal surface of the silicon, processing optical glass can improve its light transmittance. Fine silica powder produced by complete hydrolysis can be used to manufacture the phosphor. Ethyl silicate is raw material for silicone oil. Ethyl silicate can also be used to manufacture heat-resistant, chemical-resistant coatings. In Japan, 90% of ethyl silicate is used as an anti-corrosion coating (zinc-rich paint) base material.
3. Tetraethyl orthosilicate is Mainly used in chemical-resistant coatings and heat-resistant coatings, used as silicone solvent and precision-made binder. Fine silica powder produced after complete hydrolysis, used for the manufacture of phosphor, also used as a chemical reagent.
4. Tetraethoxysilane is mainly used in optical glass, chemical resistant coatings and heat-resistant coatings and adhesives, modification for anti-corrosion coating, used as crosslinking agent, a binder, a dehydrating agent, used for manufacturing catalyst skeleton, high purity ultrafine silica.
5. Used as Insulating materials in electronic industry, coatings, optical glass treatment agents, coagulants, used for organic synthesis, used as solvents for the preparation of organosilicon.