CAS No.: 1185-55-3
Molecular Formula: C₄H₁₂O₃Si
Molecular Weight: 136.2218
Physical Properties
- Appearance: Colorless to pale yellow transparent liquid
- Kinematic viscosity (25℃): 1–5 mm²/s
- Density (25℃): 0.920–1.020 g/cm³
- Acid value: < 0.5 mg/g
Main Applications
- Used as water repellent, release agent, mold release agent, defoamer
- Used in waterproof and anti-corrosion coatings
- Used for methyl block RTV silicone rubber
Chemical Properties
Polymethyltriethoxysilane is an oligomer of methyltriethoxysilane with an average polymerization degree of 2–3.
- Characteristic odor; flammable liquid
- Hydrolyzes and condenses easily in water under acidic or alkaline conditions
- Hydrolyzed and condensed products are high-molecular compounds that finally crosslink to form a film
- Provides excellent hydrophobicity and high heat resistance