Item Name: DOWSIL™ 3-6635 Dielectric Gel
Manufacturer: Dow
Technologies: Silicone dielectric gel
Color: Clear
Cure Type: Heat cure
Package Size: 210 mL dual cartridges, 1 gallon pails, 5 gallon pails, 55 gallon drums
Shelf Life: 6 months
DOWSIL™ 3-6635 is a one-part, clear, heat-cured dielectric gel designed for low-temperature resilience and reliable electronic protection. It maintains flexibility from -80°C to 200°C, providing stress relief and cushioning against thermal and mechanical strains. With low viscosity for efficient flow under components, the gel cures into a soft, self-healing material that combines liquid-like stress relief with elastomeric stability, making it ideal for delicate electronic assemblies.
Encapsulation of PCB assemblies operating in extreme low temperatures.
Electrical insulation for high-voltage circuits.
Stress relief to mitigate CTE mismatch in electronic components.
Moisture and contaminant isolation for sensitive devices.
Optoelectronic applications requiring stress relief and stable refractive index.
Repairable encapsulation layers for PCB rework.
| Property | Unit | Result |
|---|---|---|
| Viscosity (Uncured) | cP / mPa·s / Pa·s | 700 / 700 / 0.7 |
| Specific Gravity (Uncured) | – | 1.0 |
| Gel Time @ 135°C | minutes | 10.8 |
| Rheometer T90 Cure Time @ 100°C | minutes | 48 |
| Rheometer T90 Cure Time @ 125°C | minutes | 6.6 |
| Rheometer T90 Cure Time @ 150°C | minutes | 6.4 |
| Heat Cure Time @ 100°C | minutes | 120 |
| Gel Hardness | grams | 70 |
| Penetration | 1/10 mm | 85 |
| Dielectric Strength | volts/mil / kV/mm | 525 / 20 |
| Dielectric Constant @ 100 Hz | – | 2.83 |
| Dielectric Constant @ 100 kHz | – | 2.84 |
| Volume Resistivity | ohm·cm | 4.8 × 10¹³ |
| Dissipation Factor @ 100 Hz | – | 0.0002 |
| Dissipation Factor @ 100 kHz | – | <0.0001 |
| Shelf Life @ 25°C | months | 6 |
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