In modern electronic designs striving for higher power density, the Contact Thermal Resistance between heat-generating components (like MOSFETs and IGBT modules) and heatsinks remains a critical bottleneck. While standard Thermal Pads effectively fill micro-gaps, specific applications—such as high-power supply assembly or FPC multi-layer lamination—subject the pad to extreme mechanical stress and high-voltage insulation challenges. Here, standard materials often fail due to “stress concentration,” leading to cracking or electrical breakdown.
The solution lies in composite materials. Thermal Conductive Silicone-Fiberglass Cloth leverages a unique mechanically enhanced structure to deliver both robust physical properties and superior thermal management.
Materials Science: Fiberglass Reinforcement & Dielectric Strength Models The efficiency of thermal silicone cloth stems from its molecular-level composite architecture, combining soft thermal silicone with strong alkali-free fiberglass mesh:
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Mechanical Enhancement & Tear Strength: When compressed, standard silicone concentrates stress at surface defects, causing crack propagation (cold flow effect). The internal fiberglass mesh acts as a stress distributor. During screw tightening or lamination, stress is transferred through the silicone matrix to the robust fiberglass, preventing the pad from “squeezing out” or tearing at sharp corners. Tear Strength (Ts) is defined by the formula: Ts = F / d (Ts = Tear Strength, F = Maximum tensile force at break, d = Material thickness) Lixing Composite Materials utilizes precise coating technology to ensure a Ts value significantly higher than standard thermal pads, meeting the demands of automated Pick & Place production.
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Electrical Insulation & Dielectric Breakdown Voltage: In power electronics, heatsinks are typically grounded while components carry high voltage. The tThermal Conductive Silicone-Fiberglass Cloth must be a perfect electrical barrier. Fiberglass inherently possesses a high dielectric constant; combined with high-purity silicone, it provides excellent dielectric breakdown voltage (V_b). The total interface thermal resistance (R_total) consists of: R_total = R_bulk + R_contact1 + R_contact2 Although it contains fiberglass, Lixing’s optimized surface wetting minimizes R_contact, maintaining low thermal resistance while ensuring high electrical insulation (e.g., V_b > 6kV/mm).
Industrial Applications: Power Supplies, ACF Lamination, and Automotive
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High-Power Supply Assembly: Withstands uneven pressure from screw mounting, preventing pad damage and ensuring long-term reliable insulation.
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FPC/PCB Vacuum Lamination: Acts as an equalizing and buffering layer. Its temperature resistance (-60°C to +200°C) meets ACF hot-bar process requirements without releasing low-molecular-weight siloxanes that could contaminate the circuit board.
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