• Item Name: DOWSIL™ SE 9189 L Gray RTV
• Manufacturer: The Dow Chemical Company
• Technologies: One-part polydimethylsiloxane, moisture-cure silicone
• Color: Gray
• Cure Type: Room temperature moisture cure, optional mild heat acceleration
• Package Size: Contact to Techniq VN for details
• Shelf Life: Contact to Techniq VN for details
1. Product Overview
DOWSIL™ SE 9189 L Gray RTV is a one-part, flowable silicone adhesive designed for electronics assembly and sealing applications. It cures at room temperature to form a soft, low-stress elastomer, ensuring reliability while offering fast tack-free time and controlled volatility. With no added solvents and UL 94 V-0 flame resistance rating, it provides safer processing and improved durability. Its formulation supports faster in-line processing with optional mild heat acceleration and is particularly suitable where flame resistance and stress reduction are critical.
2. Applications
Fixing parts on circuit boards
Vibration dampening in electronic assemblies
General sealing applications requiring flame resistance
3. Typical Properties
DOWSIL™ SE 9189 L Gray RTV demonstrates strong performance across mechanical, electrical, and processing parameters. It offers fast curing, excellent dielectric properties, and reliable adhesion to glass and other substrates. Its elongation and softness ensure stress relief, while its electrical insulation characteristics support electronic use. Controlled low molecular weight siloxane content ensures stability and minimizes contamination.
| Property | Unit | Result |
|---|---|---|
| One-part or two-part | – | One |
| Color | – | Gray |
| Viscosity | cP / Pa·s | 22,000 / 22 |
| Specific Gravity (cured) | – | 1.19 |
| Tack-free time at 25°C | min | 8 |
| Lap shear adhesion (glass) | N/cm² | 120 |
| Tensile strength | psi / MPa / kg/cm² | 284 / 2.0 / 20 |
| Elongation | % | 220 |
| Durometer | Shore A | 33 |
| Low molecular weight D4–D10 | ppm | 20 |
| Low molecular weight D4–D20 | ppm | 110 |
| Dielectric strength | volts/mil / kV/mm | 625 / 25 |
| Volume resistivity | ohm·cm | 9.0 × 10¹⁴ |
| Dielectric constant at 1 MHz | – | 3.1 |
| Dissipation factor at 1 MHz | – | 0.0004 |
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