Item Name: DOWSIL™ TC-4551 CV Thermally Conductive Gap Filler
Manufacturer: Dow
Technologies: Two-part silicone, thermally conductive, addition-cure
Color: Part A – White, Part B – Blue
Cure Type: Room temperature or heat accelerated cure
Package Size: Contact to Techniq VN for details.
Shelf Life: 6 months
DOWSIL™ TC-4551 CV is a two-part silicone-based thermally conductive gap filler with a thermal conductivity of 5.2 W/m·K. It cures at room temperature or with heat acceleration to form a soft, compressible elastomer that ensures reliable heat dissipation. The formulation provides long-term stability under thermal cycling up to 150°C, low volatility, and strong dielectric insulation. It maintains vertical position after curing, requires no post-cure, and is suitable for confined geometries without exothermal reaction. Designed for robust cooling in automotive and high-reliability electronics, it combines thermal management with vibration and stress relief.
Cooling solution for PCB-mounted automotive control units (engine, transmission modules)
Heat transfer from electronic modules to heat sinks or housings
Thermal interface in environments with high cycling stress and extended operating life
Situations demanding compressible, low-resistance gap fillers for stable long-term performance
| Property | Condition | Value |
|---|---|---|
| Part Type | – | Two-part (A+B, 1:1 mix) |
| Color | Part A: White; Part B: Blue; Mixed: Blue | |
| Viscosity | Part A / B | 290 Pa·s each |
| Viscosity (Mixed) | 10 s⁻¹ | 250 Pa·s |
| Thixotropic Index | Mixed | 3.0 |
| Working Time | 25°C | 60 min |
| Cure Time | 25°C / 80°C | 120 / 15 min |
| Density (Cured) | – | 3.3 g/cm³ |
| Hardness | Shore 00 / JIS E | 54 / 25 |
| Thermal Conductivity | Various methods | 5.0–5.2 W/m·K |
| Thermal Resistivity | BLT 115 µm / 500 µm / 1500 µm | 0.3 / 1.2 / 3.1 °C/W |
| Bond Line Thickness | 0.66 MPa | 61 µm |
| Heat Capacity | -40 / 25 / 150°C | 0.72 / 0.84 / 1.06 J/g·°C |
| Volatile Siloxane (D4–D10) | – | 13 ppm |
| Dielectric Strength | – | 20 kV/mm |
| Volume Resistivity | – | 2 × 10¹² Ω·cm |
| Dielectric Constant / Dissipation Factor | 1 MHz | 6.9 / 0.005 |
| Flammability | UL 94 | V-0 (0.15 & 3.0 mm) |
| Shelf Life | 40°C | 6 months |
| Operating Temp. Range | – | -45 to 150°C |
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