• Item Name: DOWSIL™ TC-4025 Dispensable Thermal Pad
• Manufacturer: Dow
• Technologies: Two-part polydimethylsiloxane (thermally conductive dispensable pad)
• Color: Part A – White to Off-White, Part B – Blue, Mixed – Blue
• Cure Type: Room temperature cure, heat accelerated
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 9 months
DOWSIL™ TC-4025 is a two-part, 1:1 mix ratio, thermally conductive dispensable pad formulated for gap filling and thermal management in electronic devices. It cures into a flexible elastomer with strong thermal conductivity, stress relief, and shock-damping properties. The material is printable or dispensable, reworkable, and offers lower cost of ownership than fabricated pads. It operates reliably in the range of -45°C to 200°C, making it suitable for demanding environments.
Thermal interface material for telecom equipment, lamps, and luminaires.
Gap-filling for improved heat dissipation in compact consumer and electronic devices.
Applied through automated dispensing, stencil printing, or screen printing.
| Property | Condition | Value |
|---|---|---|
| Part A Color | – | White to Off-White |
| Part B Color | – | Blue |
| Mixed Color | – | Blue |
| Viscosity (Part A) | – | 126,000 cPs |
| Viscosity (Part B) | – | 127,000 cPs |
| Viscosity (Mixed) | – | 119,000 cPs |
| Specific Gravity (Cured) | – | 2.81 g/cm³ |
| Working Time (Pot Life) | 25°C: 5 h | |
| Cure Time at 25°C | – | 24 h |
| Heat Cure Time | 125°C: 30 min | |
| Durometer Hardness | Shore 00 | 61 |
| Thermal Conductivity | – | 2.51 W/mK |
| Tensile Strength | – | 0.34 MPa |
| Elongation | – | 66% |
| Dielectric Strength | – | 15.4 kV/mm |
| Volume Resistivity | – | 8.84 × 10¹³ Ω·cm |
| Dielectric Constant | 100 Hz: 3.31 / 100 kHz: 2.94 | |
| Dissipation Factor | 100 Hz: 0.34 / 100 kHz: 0.004 | |
| Flammability | UL94 | V-0 |
| Shelf Life | – | 9 months |
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