• Item Name: DOWSIL™ EE-3200 Low Stress Encapsulant
• Manufacturer: Dow
• Technologies: Two-part silicone encapsulant (1:1 mix ratio, low viscosity, low stress)
• Color: Part A – Off-white; Part B – Black; Mixed – Dark grey to black
• Cure Type: Room temperature cure (heat accelerated optional)
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
DOWSIL™ EE-3200 Low Stress Encapsulant is a two-part, 1:1 mix ratio, low-viscosity silicone encapsulant engineered for delicate electronic assemblies. It provides low durometer hardness, good thermal conductivity, and excellent flowability for filling fine gaps. The material cures at room temperature or with heat acceleration, ensuring process flexibility and reduced internal stress during thermal cycling. With high dielectric strength, water resistance, and EN45545-2 HL3 flame safety certification, it delivers reliable long-term protection under demanding conditions.
Power conversion devices (inverters, converters).
Junction boxes in industrial and automotive sectors.
Automotive PCB modules requiring thermal and environmental stability.
Railways PCB systems, where flame resistance and water ingress prevention are critical.
| Property | Unit | Still Not Mixed (Part A) | Still Not Mixed (Part B) | After Mixed |
|---|---|---|---|---|
| Color | – | Off-white | Black | Dark grey to black |
| Viscosity | cP | 1400 | 2000 | 1700 |
| Specific Gravity | – | 1.48 | 1.46 | 1.48 (cured) |
| Mix Ratio | – | 1 | 1 | 1:1 |
| Working Time at 25°C (Pot Life) | minutes | – | – | 30 |
| Gel Time | minutes | – | – | 50 (22°C), 6 (50°C) |
| Cure Time | – | – | – | 3 h (25°C), 20 min (50°C) |
| Durometer | Type 000 | – | – | 43 |
| Thermal Conductivity | W/mK | – | – | 0.5 |
| Tensile Strength | psi / MPa | – | – | 33 / 0.2 |
| Elongation | % | – | – | 340 |
| Secant Modulus (100% elongation) | psi / MPa | – | – | 8 / 0.06 to 12.7 / 0.09 |
| Water Absorption | % | – | – | 0.13 |
| Linear CTE | μm/m°C | – | – | 360 |
| Glass Transition Temperature | °C | – | – | -114 |
| Adhesion (Peel, FR-4 / Aluminum) | lbf/in | – | – | 0.3–0.8 |
| Dielectric Strength | volts/mil / kV/mm | – | – | 350 / 14 |
| Volume Resistivity | ohm·cm | – | – | 1E+15 |
| Dielectric Constant | – | – | – | 2.7 (100 Hz–1 MHz) |
| Dissipation Factor | – | – | – | 0.006 (100 Hz) – 0.0007 (1 MHz) |
| UL Flame Class | – | – | – | V-0 (EN45545-2 HL3 certified) |
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