How to choose a thermally conductive silicone sheet

One of the advantages of thermally conductive silicone film is usually a softer, more flexible material, thermal conductivity is the best, there is also a thickness range that can be adjusted, very suitable for filling the cavity, operable performance and maintenance of strong.

The main advantage of choosing a thermally conductive silicone film is that it reduces the surface, the contact surface, and the heat sink to create a contact thermal resistance.


What kind of thermally conductive silicone film is of higher quality?


1. Thermal conductivity
Thermal conductivity is defined as the temperature difference between the two surfaces of a 1m-thick material under stable heat transfer conditions of 1 degree (K, °C), at 1 hour. The heat transferred through 1 square meter area, the unit is W/m-degree (W/(m-K), here is K can be replaced by ℃). The higher the thermal conductivity of the thermally conductive silicon film, the faster the efficiency of conduction of heat from electronic components to the heat sink, and the better the thermal conductivity.


2. hardness selection
Shore hardness is generally used to measure the hardness of thermally conductive materials. The test principle is that a defined diamond punch is dropped on the surface of the sample from a fixed height. The ratio of the bouncing height to the falling height is used to calculate the Shore hardness. Thermally conductive silicone film has less hardness, softer hand feel, and certain ductility, so it can better fit the interface gap of the components and reach the goal of the heat conductive silicone film. better heat flow transfer; if the silicone film is too hard to fill the gaps effectively, it will also be too hard for the heat flow to pass through. Therefore, the hardness is reduced. If the hardness of the thermally conductive silicone film is too low, there will be deformation and tear in the installation process. situation. To avoid this situation, some of the major manufacturers with strength and experience, such as, for example, Voltimo, are meeting the heat conduction needs of The thermal conductive silicone film will be reinforced, thus enhancing the toughness of silicone film.


3.Thickness selection
The silicone material has a certain resistance to compression, which can be compressed to enhance the fit of the silicone film to effectively reduce the heat flow transfer distance. The thickness of the silicone sheet is selected according to the specific components.


4. specific gravity size of various thermal insulation materials porosity is usually high, relatively speaking, their specific gravity is also very low; and as a thermal conductive The opposite is true for silicone sheets, where the larger the porosity, the more compromised the heat transfer performance of the heat transfer material.


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