What Are the Thermal Properties of Silicone Thermal Pads?

Heat Sink Thermal Pad

Thermal pads are often used as thermal interface materials (TIMs) between the PCB and the heat sink to improve heat transfer and dissipation. They are designed to fill in any gaps or irregularities between the two surfaces, ensuring maximum contact and efficient heat transfer. The thermal properties of silicone thermal pads include:

Thermal conductivity

The thermal conductivity of silicone thermal pads typically ranges from 0.8 ~ 15 W/m.K. The higher the thermal conductivity, the more effective the silicone thermal pad is at transferring heat.

Thermal resistance

The thermal resistance of silicone thermal pads is typically in the range of 0.05 ~ 0.3 K·in²/W. The lower the thermal resistance, the better the ability of the silicone thermal pad to dissipate heat.

Operating temperature range

Silicone thermal pads can operate within a wide temperature range, typically from -40 ~ +200°C. The operating temperature range of a silicone thermal pad depends on it's formulation and the specific application requirements.

Electrical insulation

Silicone thermal pads are electrically insulating, which makes them suitable for use in electronic applications where electrical isolation is required.


Silicone thermal pads are compressible, which allows them to conform to the surface of electronic components and heat sinks, ensuring good thermal contact.


Silicone thermal pads are generally durable and can withstand repeated thermal cycling without significant degradation in their thermal properties.

When selecting a thermal pad for your heat sink, it's important to consider factors such as thickness, thermal conductivity, and compression force. The thickness of the pad should be appropriate for your application to ensure proper contact between the heat sink. The thermal conductivity of the pad should be high enough to facilitate efficient heat transfer, while the compression force should be sufficient to maintain good contact between the surfaces over time.

There are a variety of thermal pads available on the market, each with it's own unique properties and performance characteristics. It's important to select the right thermal pad for your specific application to ensure optimal thermal management. If you need further information or assistance in selecting the right thermal pad for your heat sink, please feel free to contact us.

If you would like to learn more about AOK performance thermal materials, please visit our website at www.aok-technologies.com

Updated on:2023-07-10 10:08:18
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