Item Name: DOWSIL™ TC-5515 LT Low Density 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: 9 months
DOWSIL™ TC-5515 LT is a low-density, two-part silicone thermally conductive gap filler with a conductivity of 2.0 W/m·K and specific gravity of 1.95. It cures at room temperature or with accelerated heat, forming a soft, compliant, and tacky elastomer that offers stress relief, vibration damping, and long-term cooling reliability. The cured material is non-flowable, holds vertical placement, and is reworkable after assembly. It provides dielectric insulation, resistance to environmental contaminants, and durability across a wide temperature range (-45 to 150°C).
Heat dissipation for EV modules and battery packs
Cooling for printed circuit boards and electronic devices
Thermal interface in assemblies exposed to vibration and cycling stresses
Gap filling where lightweight, reworkable, and stable thermal materials are required
| Property | Condition | Value |
|---|---|---|
| Part Type | – | Two-part (A+B, 1:1 mix) |
| Color | Part A: White; Part B: Blue | |
| Viscosity | Part A / Part B | 150 / 120 Pa·s |
| Viscosity (Mixed) | 10 s⁻¹ | 140 Pa·s |
| Thixotropic Index | Mixed | 3.5 |
| Working Time | 25°C | 90 min |
| Cure Time | 25°C / 80°C | 360 / 30 min |
| Specific Gravity | Cured | 1.95 |
| Hardness | Shore 00 | 65 |
| Thermal Conductivity | Hot Disk method | 2.0 W/m·K |
| Heat Capacity | 20 / 80 / 150°C | 1.40 / 1.58 / 1.72 J/g·°C |
| Dielectric Strength | – | 19 kV/mm |
| Volume Resistivity | – | ≥1 × 10¹³ Ω·cm |
| Dielectric Constant / Dissipation Factor | 100 kHz | 3.0 / 0.0087 |
| Lap Shear Strength (Al/Al) | – | 0.20 MPa |
| Shear Modulus (DMA) | – | 0.27 MPa |
| CTE | -40 to 150°C | 132 ppm/K |
| Minimum BLT | 0.14 / 0.42 MPa | 142 / 127 µm |
| Flammability | UL 94 | V-0 |
| Shelf Life | 25°C | 9 months |
| Operating Temp. Range | – | -45 to 150°C |
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