Crosile® SI28 is a monomeric ethyl silicate, also known as tetraethyl orthosilicate (TEOS). After hydrolysis, it yields 28 wt.% silica, hence the name Ethyl Silicate-28. It has the following chemical formula.
Tetraethyl orthosilicate, also known as tetraethoxysilane (TEOS), is an organic compound denoted by the formula Si(OC2H5)4. This colorless liquid undergoes degradation when exposed to water. TEOS serves as the ethyl ester of orthosilicic acid, Si(OH)4, and is widely recognized as the predominant silicon alkoxide.