Item Name: DOWSIL™ TC-4535 CV Thermal Conductive Gap Filler
Manufacturer: Dow
Technologies: Two-part thermally conductive silicone
Color: Part A – White; Part B – Blue
Cure Type: Room temperature or accelerated heat cure
Package Size: Contact to Techniq VN for details.
Shelf Life: 12 months
DOWSIL™ TC-4535 CV is a two-part silicone-based thermally conductive gap filler with high conductivity of 3.4 W/m·K and specific gravity of 3.1. It cures at room temperature or with accelerated heat, forming a flexible elastomer that maintains long-term stability up to 150°C and peaks at 175°C. The material offers low thermal resistance, excellent vertical hold, controlled silicone volatility, and UL 94 V0 flame resistance. It is engineered to enhance cooling efficiency and reliability in demanding environments.
Heat dissipation in engine and transmission control units
PCB module assemblies bonded to heat sinks
Electronic devices requiring low thermal resistance and reliable long-term cooling
Thermal management in compact or high-performance designs
| Property | Condition | Value |
|---|---|---|
| Part Type | – | Two-part (A+B, 1:1 mix) |
| Color | Part A: White / Part B: Blue | |
| Viscosity | Part A / Part B | 200 / 230 Pa·s |
| Viscosity (Mixed) | 10 s⁻¹ | 205 Pa·s |
| Thixotropic Index | Mixed | 3.6 |
| Working Time | 25°C | 60 min |
| Cure Time | 25°C | 120 min |
| Specific Gravity | Cured | 3.1 |
| Hardness | Shore 00 | 52 |
| Thermal Conductivity | Hot Disk method | 3.4 W/m·K |
| Thermal Resistance | 120 / 501 / 1500 µm | 0.45 / 1.52 / 4.47 °C·cm²/W |
| Heat Capacity | 20 / 80 / 150°C | 0.823 / 0.962 / 1.071 J/g·°C |
| Minimum BLT | 0.14 / 0.42 MPa | 95 / 61 µm |
| Volatile Siloxane Content | D4–D10 | 8 ppm |
| Dielectric Strength | – | 22 kV/mm |
| Volume Resistivity | – | 3 × 10¹³ Ω·cm |
| Dielectric Constant / Dissipation Factor | 1 MHz | 6.5 / 0.005 |
| Flammability | UL 94 | V-0 |
| Shelf Life | 25°C | 360 days |
| Operating Temp. Range | – | -45 to 175°C (up to 200°C short term) |
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