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Ultra-Soft Thermal Pads for HBM, VRM and High-Density AI Servers Meeting the Thermal Challenges of Next-Generation AI Computing The rapid development of artificial intelligence (AI), machine learning, and high-performance computing has significantly increased the power density of modern servers. Advanced AI servers equipped with HBM (High Bandwidth Memory), GPUs, VRMs, and AI accelerators generate tremendous heat within extremely compact spaces.   Traditional thermal interface materials may struggle to meet the requirements of these applications due to limited compressibility, insufficient surface contact, and increased mechanical stress on sensitive components. To address these challenges, ultra-soft thermal pads have become an ideal thermal management solution for high-density computing systems.   ZIITEK’s ultra-soft thermal pads provide excellent thermal performance while maintaining low compression force, enabling efficient heat transfer and reliable operation for advanced AI hardware. Why Ultra-Soft Thermal Pads Are Essential for AI Servers 1. Excellent Conformability for Complex Component Gaps AI server structures often contain uneven surfaces, microscopic gaps, and different component heights between heat sources and cooling systems.   Ultra-soft thermal pads feature high flexibility and compressibility, allowing them to closely conform to irregular surfaces and maximize contact area. This helps minimize thermal resistance and improves heat dissipation efficiency.   For applications such as HBM stacks, VRM modules, GPU power components, and server cooling assemblies, soft thermal pads provide better interface contact compared with conventional rigid materials. 2. Low Compression Stress Protects Sensitive Components Modern AI processors and memory packages are becoming increasingly sophisticated and fragile. Excessive mechanical pressure during assembly may cause component deformation or reliability issues.   Ultra-soft thermal pads are designed with low compression stress, reducing mechanical load on delicate electronic components while maintaining stable thermal performance.   This makes them particularly suitable for: High-performance GPUs HBM memory modules VRM power circuits AI accelerator cards Data center server systems 3. High Thermal Conductivity for Increasing Heat Loads As AI workloads continue to grow, chip power consumption and heat generation are increasing rapidly. Efficient thermal management has become a critical factor affecting system performance and reliability. ZIITEK thermal pads are available with various thermal conductivity options to meet different cooling requirements. Combined with excellent softness and conformability, these materials help transfer heat effectively from electronic components to heat sinks, cold plates, or liquid cooling systems. Ultra-Soft Thermal Pads for HBM and VRM Cooling Applications HBM Thermal Management High Bandwidth Memory (HBM) plays a critical role in AI computing platforms by providing extremely high data transfer rates. However, HBM packages generate significant heat in a limited area. Ultra-soft thermal pads help provide: Improved contact between HBM modules and cooling structures Reduced thermal resistance Stable performance under continuous AI workloads VRM Thermal Management Voltage Regulator Modules (VRMs) are essential for supplying stable power to high-performance processors. During intensive computing operations, VRMs can generate substantial heat. A soft and reliable thermal pad solution helps efficiently transfer VRM heat to heat spreaders, chassis structures, or cooling plates, improving overall server reliability. ZIITEK Thermal Solutions for High-Density AI Servers With extensive experience in thermal interface materials (TIMs), ZIITEK provides customized thermal solutions for advanced electronic applications, including: AI servers and data centers GPU computing platforms High-performance workstations Automotive electronics Industrial control systems ZIITEK ultra-soft thermal pads can be customized in thickness, size, hardness, and thermal conductivity to meet different application requirements.   Key advantages include: ✔ Ultra-soft and highly compressible design ✔ Excellent surface conformability ✔ Low mechanical stress on components ✔ Reliable long-term thermal performance ✔ Custom die-cut shapes available Conclusion: Enabling Efficient Cooling for Future AI Infrastructure As AI servers continue to evolve toward higher computing density and greater power consumption, advanced thermal management solutions are becoming increasingly important.   Ultra-soft thermal pads provide an effective balance between thermal conductivity, flexibility, and mechanical protection, making them an ideal choice for HBM, VRM, GPU, and high-density AI server applications.   ZIITEK is committed to developing high-performance thermal interface materials that help customers achieve reliable cooling performance and support the next generation of AI computing technologies.   Contact ZIITEK today for customized ultra-soft thermal pad solutions for your AI server thermal management needs.

Why Thermal Conductivity Is Not Enough When Choosing a Thermal Pad? When selecting a thermal pad, thermal conductivity is often the first specification engineers look at. A material with 10 W/m·K or 15 W/m·K may appear to offer better thermal performance than one rated at 5 W/m·K.   However, thermal conductivity alone does not determine how well a thermal pad performs in a real electronic device.   For applications such as AI servers, GPUs, CPUs, power modules, automotive electronics and battery systems, engineers need to consider several other factors, including thermal resistance, thickness, compressibility, contact pressure, electrical insulation, reliability and application conditions. 1. Thermal Conductivity vs. Thermal Resistance Thermal conductivity, expressed in W/m·K, describes how effectively a material conducts heat. But the actual heat-transfer performance of a thermal pad depends on more than conductivity. A simplified relationship is: Thermal Resistance ≈ Thickness / (Thermal Conductivity × Contact Area) This means that a high-conductivity thermal pad may not necessarily provide low thermal resistance if it is too thick or does not achieve good contact with the mating surfaces. For example, a 15 W/m·K thermal pad with poor surface contact may perform worse than a lower-conductivity pad that conforms closely to the component and heatsink. Therefore, engineers should evaluate thermal resistance under actual application conditions, rather than comparing W/m·K values alone. 2. Thickness Matters Thermal pad thickness is another critical factor. Electronic components and heatsinks rarely have perfectly flat surfaces. A thermal pad is typically used to fill the gap between two surfaces. If the pad is too thin, it may not adequately compensate for surface irregularities. If it is too thick, the additional material thickness can increase thermal resistance. Therefore, selecting the right thickness is a balance between: Gap size Thermal resistance Compressibility Surface flatness Assembly tolerance For applications such as GPU thermal management and AI server cooling, precise thickness selection can be particularly important because the available thermal interface gap may be very limited. 3. Compressibility and Conformability A good thermal pad should be able to conform to the surfaces of the heat source and heatsink. This is where compressibility becomes important. A soft and conformable thermal pad can fill microscopic surface irregularities and reduce air gaps. Air has very low thermal conductivity, so minimizing air gaps can significantly improve heat transfer. However, excessive softness is not always desirable. The material must also provide sufficient mechanical stability during assembly and long-term operation. Therefore, engineers should consider: Compressibility + Contact Pressure + Surface Conformability rather than simply choosing the material with the highest thermal conductivity. 4. Electrical Insulation Can Be Critical Many electronic applications require a thermal interface material to provide both thermal conductivity and electrical insulation. For example, thermal pads may be used around: Power semiconductor devices MOSFETs IGBTs GPU modules Automotive electronics Battery systems Power supplies In these applications, a material with excellent thermal conductivity may not be suitable if it does not meet the required electrical insulation requirements. Depending on the design, engineers may need to evaluate properties such as: Dielectric strength Volume resistivity Breakdown voltage Electrical insulation stability The ideal thermal pad must therefore meet the electrical and thermal requirements simultaneously. 5. Mechanical Reliability and Compression Set Electronic devices can operate for thousands of hours under continuous thermal cycling. During operation, components may repeatedly expand and contract as temperatures change. A thermal pad must maintain sufficient contact throughout this process. Important properties can include: Compression set Tensile strength Tear resistance Mechanical stability Long-term compression behavior A thermal pad that performs well during initial testing may not maintain the same performance after prolonged thermal cycling if its mechanical properties are not suitable. This is especially important for automotive electronics, EV battery systems and industrial power electronics, where long-term reliability is a major consideration. 6. Operating Temperature Range Thermal performance should also be evaluated across the actual operating temperature range. A thermal pad used in a consumer electronic device may have very different requirements from one used in an automotive or industrial application. Engineers should consider: Minimum operating temperature → Normal operating temperature → Maximum operating temperature The material should maintain its mechanical and thermal properties throughout the required temperature range. For demanding applications, testing under thermal cycling and accelerated aging conditions can provide additional information about long-term reliability. 7. Processability and Die-Cutting In mass production, the thermal pad is rarely used simply as a rectangular sheet. It may need to be converted into a custom shape with: Holes Slots Steps Notches Multiple dimensions Adhesive layers Therefore, die-cutting capability and dimensional stability can also influence material selection. A thermal pad with excellent thermal conductivity but poor processing characteristics may increase production complexity or manufacturing costs. For OEM and ODM applications, customized thermal pads can help simplify assembly and improve consistency. 8. Thermal Pad Selection Should Be Application-Based There is no single thermal pad that is ideal for every application. Different devices may prioritize different properties.   Application Important Thermal Pad Considerations AI Server Thermal conductivity, low thermal resistance, compressibility, reliability GPU / CPU Gap thickness, conformability, thermal resistance Power Electronics Thermal conductivity, electrical insulation, reliability EV Battery Thermal performance, insulation, compression, temperature resistance Automotive Electronics Reliability, thermal cycling, electrical insulation Industrial Electronics Temperature range, mechanical stability, long-term reliability   This is why thermal pad selection should begin with the actual application requirements, rather than starting with thermal conductivity alone. How to Choose the Right Thermal Pad? Before selecting a thermal pad, engineers should consider at least the following parameters: 1. Thermal conductivity What level of heat transfer is required? 2. Thermal resistance What is the actual thermal performance at the required thickness and pressure? 3. Gap thickness What is the actual gap between the heat source and heatsink? 4. Compressibility How much compression is available during assembly? 5. Electrical insulation Does the application require dielectric insulation? 6. Operating temperature What are the minimum and maximum operating temperatures? 7. Mechanical reliability Can the material maintain performance during long-term compression and thermal cycling? 8. Manufacturing requirements Does the material need die-cutting, adhesive backing or customized dimensions? ZIITEK Thermal Pads for Advanced Thermal Management For demanding applications, ZIITEK provides a range of Thermal Interface Materials (TIMs) designed for electronics thermal management. ZIITEK thermal pads can be customized according to application requirements such as thermal conductivity, thickness, dimensions, compressibility, electrical insulation and operating temperature. They can be used in applications including AI servers, GPUs, CPUs, power electronics, automotive electronics, EV battery systems and industrial equipment. Instead of selecting a thermal pad based only on its W/m·K value, engineers should evaluate the complete thermal interface system—including thermal resistance, thickness, contact conditions, mechanical properties and long-term reliability. Need Help Selecting the Right Thermal Pad? Share your application, gap thickness, dimensions, operating temperature and thermal requirements with the ZIITEK team. We can help you evaluate a suitable thermal pad solution for your application.