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Boiling Point: 169°
EINECS Number: 201-083-8
Melting Point: -77°
Molecular Weight: 208.33
Alternative Name: TETRAETHYLORTHOSILICATE; TEOS
Specific Gravity: 0.9335
Flashpoint: 46°C (115°F)
HMIS Key: 2-2-1-X
Hydrolytic Sensitivity: 7: reacts slowly with moisture/water
Refractive Index: 1.3818
Application: Source by hydrolysis of SiO2 and sol-gel derived glasses.1
Intermediate for silica spheres with controlled dimensions.2
Reference: 1. Brinker, C. et al. Sol-Gel Science; Academic Press: 1990.
2. Stöber, W. et al. J. Coll. Interface Sci. 1968, 26, 62.
Additional Properties: 260Dipole moment: 1.63 debyeVapor viscosity, 60°: 60 micropoiseCritical temperature: 616°Dielectric constant: 4.1Coefficient of thermal expansion: 1.1 x 10-3Solubility parameter: 7.87Coefficient of thermal conductivity: 4.0Specific heat: 0.55 cal/g/°28 - 9% SiO2 equivalentTEOS forms low density insulating aerogelsVapor pressure, 20°: 11.8 mmVapor pressure, 60°: 12 mmVapor pressure, 108°: 200 mmDipole moment: 1.63 debye