Why does the use of thermal conductive silicon film on laser machines result in poor heat conduction

When choosing the type of thermal conductive silicone film, an important parameter is the thermal conductivity coefficient. Although this is important, the hardness, thickness, and blocking voltage of the thermal conductive silicone film can also greatly affect the thermal conductivity of the product. When choosing a thermal conductive silicone film, we should consider the shape, specifications, and heat resistance of the product, and then choose a suitable thermal conductive silicone film comprehensively. The higher the thermal conductivity coefficient, the more suitable it is, and the better the conductivity.

When using a thermal conductive silicone sheet product with a coefficient of 3.0 and a thickness of 0.8 from a certain company on the market, the effect is not good when the thermal conductive silicone sheet is too soft to conduct heat when applied to a laser machine, indicating that the thickness chosen is slightly uneven.

Because the thermal conductivity is inversely proportional to the thickness, the thicker the thickness, the slower the heat transfer effect. At the same time, the thicker the thermal conductive silicone sheet, the more expensive and costly it is (because for the same size, the thicker the thickness, the more materials are used)

The relationship between thermal conductivity and hardness: If the product is harder, the contact between the thermal conductive silicone and the heating and cooling components will be poorer. The softer, the more complete the contact (but not necessarily the better, as it is too soft and not easy to stick).

We tested our LC300 thermal conductive silicone sheet product with a thickness of 0.5, hardness of 30 ± 5, density of 2.7, tear strength of 0.29, and applied it to a laser machine. The test results were ideal and the thermal conductivity was also good.