Polymethyltriethoxysilane

INTRODUCTION

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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