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High thermal conductivity (1.5 W/m·K) combined with elastomeric compliance for low interfacial resistance.
Excellent long-term stability under thermal cycling and elevated temperature exposure (up to 200 °C continuous).
Electrically insulating formulation—prevents short circuits while enabling efficient heat dissipation.
Soft, conformable silicone elastomer that accommodates dimensional variation and surface irregularities.
Ready-to-use, two-part addition-cure system with low mixed viscosity and extended pot life.
Thermal interface material (TIM) between power electronics modules and heat sinks in EV inverters.
Heat transfer pads for high-power LED lighting assemblies requiring vibration damping and thermal management.
Conformal gap-filling elastomer for battery module cell-to-cold-plate interfaces in energy storage systems.
Thermal management solution for 5G base station RF power amplifiers and mmWave antenna units.
| Chemical Type | Platinum-catalyzed addition-cure silicone elastomer |
| Product Form | Two-component liquid (Part A + Part B) |
| Appearance | Opaque gray paste (Part A), translucent amber liquid (Part B) |
| Primary Applications | Thermal interface material (TIM) for power electronics and LED systems |
| Key Features | Electrically insulating, thermally conductive, compliant, low-stress cure |
| Benefits | Reduces thermal resistance, absorbs mechanical stress, eliminates need for mechanical fasteners |
| Cure System | Addition-cure (no by-products); typical full cure at 150 °C for 30 minutes |
| Storage Stability | 12 months at ≤25 °C (unopened containers) |
Q1: What is the primary function of DOWSIL 3-6651 in thermal management applications?
A: DOWSIL 3-6651 is a thermally conductive, silicone-based elastomer designed to fill air gaps between heat-generating components and heat sinks or cold plates. It provides reliable thermal interface performance while maintaining elastomeric compliance, shock absorption, and long-term stability under thermal cycling.
Q2: How does DOWSIL 3-6651 differ from traditional thermal greases or pads?
A: Unlike non-curing greases, DOWSIL 3-6651 is a curable, addition-cure silicone elastomer that forms a durable, conformable bond after curing—eliminating pump-out and dry-out risks. Compared to pre-formed pads, it offers superior conformability to irregular surfaces and customizable thickness via dispensing, without requiring compression force for optimal contact.
Q3: Is DOWSIL 3-6651 compatible with common electronic substrates and coatings?
A: Yes, it exhibits good compatibility with aluminum, copper, nickel-plated surfaces, and many common PCB finishes and conformal coatings. It is formulated to minimize corrosion risk and does not require primers on most clean, oxide-free metal surfaces. Compatibility testing under end-use conditions is recommended for critical assemblies.
Q4: What are the typical cure conditions for DOWSIL 3-6651?
A: DOWSIL 3-6651 cures at room temperature over several days, but full physical properties develop more rapidly with mild elevated temperature—commonly 1–2 hours at 80–100 °C. Cure time and profile may be adjusted based on part geometry, thickness, and production throughput requirements.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
