Triethoxyvinylsilane (CAS 78-08-0): Comprehensive Technical Overview
Table of Contents
1. Chemical Identification & Properties
| Parameter | Specification |
|---|---|
| CAS Number | 78-08-0 |
| Molecular Formula | C8H18O3Si |
| Molecular Weight | 190.31 g/mol |
| Appearance | Colorless to pale yellow liquid |
| Density | 0.903 g/mL at 25°C |
| Boiling Point | 160–161°C |
| Flash Point | 34°C (closed cup) |
| Refractive Index | n20/D: 1.398 |
Comparative Advantage: Superior thermal stability vs. peroxide crosslinkers, lower viscosity (0.9 cP at 25°C) than comparable silanes for improved processing.
2. Key Applications
2.1 Crosslinking Agent
- Primary use in silane-crosslinked polyethylene (XLPE) for wire/cable insulation
- Enables ambient-temperature curing vs. traditional high-energy radiation methods
2.2 Coupling Agent
- Glass fiber treatment: 0.5–1.5% loading improves composite interfacial adhesion
- Mineral-filled polymers: Enhances dispersion in PP/PE up to 60% filler content
2.3 Hydrophobic Coatings
- Electronics: Reduces moisture absorption in PCB substrates by 40–60%
- Construction: Water repellent for concrete with >90% contact angle retention
3. Safety & Handling
| Parameter | Requirement |
|---|---|
| Storage | Nitrogen atmosphere, <30°C, away from oxidizers |
| Flash Point | 34°C (Class IB flammable) |
| LD50 (Oral, Rat) | 22,500 mg/kg |
| PPE | Chemical goggles, nitrile gloves, vapor respirator above 50°C |
Emergency Protocol: For spills >1L, use vermiculite absorption followed by 5% acetic acid neutralization. Fire suppression requires alcohol-resistant foam.
4. Industrial Case Studies
4.1 Cable Manufacturer (China)
- Application: 110kV power cable insulation
- Result: 15% increase in production speed vs. peroxide crosslinking
- Loading: 2.1% with 0.05% dibutyltin dilaurate catalyst
4.2 Automotive Composite Supplier (Germany)
- Application: Glass fiber-reinforced polyamide
- Result: 28% improvement in tensile strength at 150°C
- Process: 0.8% aqueous pretreatment at pH 4.5
5. Technical Inquiry
For formulation assistance or bulk pricing:
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