Properties: Yellow rhombic crystals. Density 1.695 g/cm3. Melting point 211.5°C (18°C). Highly soluble in cold water. Forms a heptahydrate below 17.2°C. Transforms into a pentahydrate at 17.2°C, a dihydrate at 50–60°C, a monohydrate at 100–110°C, and becomes anhydrous when heated to 160–170°C. Used for treating metal surfaces.

CAS NO:78-10-4;1109-96-2;11099-06-2

EC NO:201-083-8

Molecular Formula:C₈H₂₀O₄Si

Molecular Weight:208.328

Synonyms:;Ethyl silicate;TEOS;Tetraethoxysilanemincolorlessliq;Tetraethoxysilaneredistilledinquartzforlowmetalimpurities;Tetraethoxysilane;Silicon ethoxide;Tetraethoxysilan;Silicon tetraethoxide;Silane Coupling Agent;Si-28; Teraethoxysilane;Silicic acid, ethyl ester;Ethyl polysilicate;Ethylpolysilikat;ETHYL SILICATE POLYMER;Ethyl Silicate 32;Ethyl Silicate 50;Silane Coupling Agent Si-40;ethoxy(oxo)silanol;diethoxy(oxo)silane;Ethyl silicate40(Polyethyl silicate-40);Polyethyl silicate-40;tetraethyl orthosilicate-40;Ethyl silicate28;Ethyl silicate-28;tetraethyl orthosilicate-28;Tetraethylorthosilicate;

Molecular Structure: