• Item Name: DOWSIL™ TC-4040 Dispensable Thermal Pad
• Manufacturer: Dow
• Technologies: Two-part silicone elastomer with thermal filler (dispensable thermal pad)
• Color: Mixed – Blue (Part A – White, Part B – Blue)
• Cure Type: Room temperature cure, heat accelerated
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 6 months
DOWSIL™ TC-4040 is a two-part, 1:1 mix ratio, thermally conductive, blue-colored dispensable thermal pad. It cures into a soft elastomer with excellent gap-filling, heat-dissipating, stress-relieving, and shock-damping properties. The material offers 4.0 W/mK thermal conductivity, low stress on devices, and compliance with UL94 V-0 flammability standards. It provides a cost-effective alternative to fabricated thermal pads and remains stable across a wide temperature range of -45°C to 200°C.
Thermal interface material for electronic devices.
Gap-filling for heat conduction between heat sources and heat sinks.
Protection of electrical/electronic assemblies requiring thermal management.
Usable in automated dispensing or printing processes.
| Property | Condition | Value |
|---|---|---|
| Part A Color | – | White |
| Part B Color | – | Blue |
| Mixed Color | – | Blue |
| Viscosity (Part A) | ASTM D1084 | 320,000 cPs |
| Viscosity (Part B) | ASTM D1084 | 350,000 cPs |
| Extrusion Rate (Mixed) | 90 psi | 350 g/min |
| Specific Gravity (Uncured) | ASTM D1475 | 3.2 |
| Working Time at 25°C | CTM 0092A | 3 h |
| Curing Time | 25°C: 24 h / 80°C: 60 min / 120°C: <5 min | |
| Durometer Hardness | ASTM D2240 | Shore 00 – 60 |
| Tensile Strength | ASTM D412 | 0.42 MPa |
| Elongation | ASTM D412 | 30% |
| Thermal Conductivity | ASTM F433 | 4.0 W/mK |
| Min Bond Line Thickness | – | 60 µm |
| Dielectric Strength | ASTM D149 | 10.2 kV/mm |
| Dielectric Constant (100 Hz) | ASTM D150 | 7.4 |
| Dissipation Factor (100 Hz) | – | 0.0143 |
| Volume Resistivity | ASTM D1169 | 3.95 × 10¹³ Ω·cm |
| Flammability | UL94 | V-0 |
| Shelf Life | – | 6 months |
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