Thermal pads and thermal silicone grease are both common thermal interface materials (TIMS), but there are significant differences between them, which cannot be ignored. GALLOP INNOTEK offers both thermal pads and thermal grease for your selection. This article will analyze the differences between the two from the aspects of performance differences, advantages and disadvantages, and application fields, to help you make an ideal choice for your project.
What is a Thermal Pad?
Thermal pads are preformed solid sheet thermal conductive materials with good elasticity and compressibility. It is generally directly attached between the heating element and the heat sink, adapting to the gap and transferring heat through its own thickness. The thermal pad is easy to install, insulating and safe, and can simultaneously cover multiple components of different heights. It is very suitable for scenarios such as memory and power supply modules.
What is Thermal Grease?
Thermal grease is a silicon-based compound with high thermal conductivity and is in a paste form. Its core function is to squeeze out air by filling the microscopic gaps at the contact surface between the heating element and the radiator, which forms an efficient heat conduction channel. Because it can achieve extremely thin application and perfect adhesion, with extremely low thermal resistance, if you are pursuing ultimate heat dissipation performance, it is your first choice.
Thermal Pad vs Thermal Grease: Performance
Thermal Conductivity
The liquid nature of thermal grease enables it to be applied extremely thinly, perfectly filling the microscopic gaps between the heating element and the heat sink and completely expelling air. This makes its thermal resistance at the interface extremely low and the heat transfer efficiency the highest, so the heat dissipation is also fast.
Thermal pads, as solid sheet materials, are much thicker than thermal grease. Although the thermal conductivity of the thermal pad material itself is not low, a thicker thickness means a longer heat conduction path, resulting in its overall thermal resistance usually being higher than that of thermal grease.
Interface Adaptability
The liquid form of thermal grease makes it highly adaptable. It can flow and perfectly adhere to any tiny uneven surface, achieving the maximum area of close contact.
Thermal pads generally rely on the elasticity and compressibility of the material to adapt to the interface. Although they can also adapt well to macroscopic height differences, their adhesion is not as good as that of flowing silicone grease at the microscopic level, and there may be tiny air gaps.
Long-term Stability
Thermal pads have extremely stable performance. As it is solid, there will be no problems of evaporation, drying out, or performance degradation. Therefore, its service life is extremely long.
Thermal grease may be squeezed out of the contact surface due to thermal expansion and contraction, and there is also a risk of silicone oil evaporation causing it to dry out and harden. Its performance will decline under long-term high-temperature and high-load conditions, which requires regular maintenance and replacement.
Electrical Insulation
Thermal pads usually have good electrical insulation properties and are very safe. Moreover, it is in a preformed sheet form, which is easy to install and disassemble. Generally, there will be no residue after cleaning.
Most thermal grease containing metal fillers is not insulating. Once it spills onto the motherboard circuit, it may cause a short circuit. Moreover, applying thermal grease requires skills, which is prone to getting dirty and difficult to clean.
Thermal Pad vs Thermal Grease: Advantages and Disadvantages
Advantages
The greatest advantage of the thermal pad is that it is very convenient to use. All you need to do is cut it, tear off the protective film and stick it on. The installation process is simple. In addition, as a solid material, it has excellent reliability and stability, and its performance can remain unchanged for a long time. Moreover, it has excellent electrical insulation properties. Even if it is covered on circuit components, there is no need to worry about the risk of a short circuit.
The core advantage of thermal grease is its extremely strong thermal conductivity. It can fill the microscopic gaps with an extremely thin thickness, which can completely expel air and achieve low thermal resistance, making it the first choice for efficient heat dissipation. Additionally, it has excellent interface adaptability. Its liquid form can flow and adhere to any tiny surface unevenness, ensuring the maximization of the contact area.
Disadvantages
The main drawback of thermal pads is that their thermal conductivity is lower than that of thermal grease. Due to its inherent thickness, its thermal resistance is relatively high and it is not suitable for cooling chips with extreme heat generation such asCPUs and GPUs. In addition, its performance is greatly limited by thickness. You must precisely select the thickness based on the gap, as a wrong selection may result in insufficient pressure or damage to the components.
The most notable drawback of thermal grease is that its application requires skill. Excessive use can contaminate surrounding components, and if it is disassembled, it must be thoroughly cleaned and reapplied. Secondly, its performance may decline due to reasons such as drying out after long-term use, so you need to replace it regularly. In addition, most high-performance thermal grease contains metal fillers, which is not insulating. Once it spills onto the motherboard, it can easily cause a short circuit risk.
Thermal Pad vs Thermal Grease: Application
Applications of Thermal Pads
Thermal pads are mainly used in scenarios that require portable installation, insulation safety, and coverage of multiple components of irregular heights, such as computer memory sticks, solid-state drives (SSD), graphics card power supply modules, and chipsets to fill the large gaps between them and heat sinks, which
achieves overall uniform heat dissipation and passive heat dissipation.
Applications of Thermal Grease
Thermal grease is specifically designed for applications that require ultimate heat dissipation performance. It is typically applied between core chips such as CPUs, GPUs and the base of the heat sink. By taking advantage of its liquid nature, it fills microscopic gaps to expel air and is the preferred material for handling high-density heat exchange.
Thermal Pad vs Thermal Grease: How to Choose
The key to choosing between a thermal pad and thermal grease lies in the balance between performance, convenience and safety.
If you are in pursuit of ultimate heat dissipation for core high-heat-generating chips such as CPUs and GPUs, and you don’t mind the cumbersome operations, then you can choose thermal grease.
If you are looking for convenient installation and safe insulation solutions for components such as memory and power supply modules, then thermal pads are your best choice.
Conclusion
The above is a detailed comparison between thermal pads and thermal grease. We believe that after reading this article, you have a better understanding of the materials you need. If you still have any related questions about thermal pads and thermal grease, please contact GALLOP INNOTEK at any time. We will provide you with professional solutions.
