DOWSIL™ TC-5515 LT Low Density Thermally Conductive Gap Filler:
DOWSIL™ TC-5515 LT is a two-part, thermally conductive silicone gap filler with a thermal conductivity of 2.0 W/m·K. It offers low density, soft compliance, and stress relief, making it suitable for dissipating heat in electronic devices. The material cures at room temperature but can be heat-accelerated for faster curing. Once cured, it maintains a tacky surface for easy rework and holds its position in vertical applications.
Key Features & Benefits:
✔ Thermal conductivity: 2.0 W/m·K
✔ Soft and compliant, providing stress relief and vibration absorption
✔ Non-flowable after dispensing, holds position in vertical applications
✔ Room-temperature curing with an optional heat-accelerated cure
✔ Surface tacky after curing for easy rework
✔ UL 94 V0 flame retardancy
DOWSIL™ TC-5515 LT is designed for heat dissipation in electronic and electrical applications, particularly in:
This gap filler enhances thermal management by ensuring efficient heat transfer between heat sources (such as EV modules) and heat sinks (such as aluminum housings).
| Property | Unit | Part A | Part B |
|---|---|---|---|
| Color | – | White | Blue |
| Viscosity @ 10 s⁻¹ | Pa·s | 150 | 120 |
| Specific Gravity | – | 1.95 | 1.95 |
| Mix Ratio (Weight/Volume) | – | 1:1 | 1:1 |
| Property | Unit | Mixed Material | Cured Material |
|---|---|---|---|
| Viscosity @ 10 s⁻¹ | Pa·s | 140 | – |
| Thixotropic Index | – | 3.5 | – |
| Working Time (25°C) | Min | 90 | – |
| Cure Time (25°C) | Min | – | 360 |
| Cure Time (80°C) | Min | – | 30 |
| Durometer Hardness | Shore 00 | – | 65 |
| Thermal Conductivity | W/m·K | – | 2.00 |
| Dielectric Strength | kV/mm | – | 19.0 |
| Volume Resistivity | Ohm·cm | – | ≥1.0E+13 |
| Dielectric Constant (100 KHz) | – | – | 3.0 |
| Dissipation Factor (100 KHz) | – | – | 0.0087 |
| Lap Shear Strength (Al/Al) | MPa | – | 0.20 |
| Shear Modulus (DMA) | MPa | – | 0.27 |
| CTE (-40 to 150°C) | ppm/K | – | 132 |
| Minimum Bond Line Thickness | μm | – | 142 (0.14 MPa), 127 (0.42 MPa) |
| UL Flame Classification | – | – | UL 94 V0 |
| Shelf Life (25°C) | Months | – | 9 |
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As the year draws to a close and the Christmas season arrives, Avantek Viet Nam would like to extend our warmest Christmas greetings to all our valued customers, partners, and friends.
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