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- Einecs Number 272-697-1
- Synonyms Fumed silica, HMDZ treated
- HMIS 2-0-0-X
- Molecular Formula SiO2
- Molecular Weight (g/mol) 60.09
- TSCA Yes
- Boiling Point (˚C/mmHg) NA
- Density (g/mL) 2.2
- Melting Point (˚C) >1,600°
- Refractive Index @ 20˚C 1.45
Organosilane-modified silica nanoparticles
A range of silica structures from 20 nm to 1 micron have been modified with silanes to reduce hydroxyl content allowing improved dispersion. Other versions have monolayers with isolated secondary amine functionality, providing controlled interactions with resins. Systems that maintain low levels of hydroxyls have improved electrical properties. Introduction of low levels of secondary amines impart improved mechanical properties particularly in high humidity environments.