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How to apply thermal grease correctly


Thermally conductive silicone grease is commonly known as heat dissipation paste. Thermally conductive silicone grease uses organic silicone as the main raw material and adds materials with excellent heat resistance and thermal conductivity to make a thermally conductive silicone grease compound. It is used in power amplifiers, transistors, electronic tubes, and CPUs. Heat conduction and heat dissipation of electronic components, so as to ensure the stability of electrical performance of electronic instruments and meters.


The method of applying thermal grease, taking CPU thermal grease as an example:

1. First clean the surface of the CPU core and heatsink with a high-purity solvent such as high-purity isoamyl alcohol or acetone and a lint-free cloth (such as the cloth used to wipe the lens) (a fingerprint may be as thick as 0.005 inches or so). This step can be omitted, as long as the surface is clean and oil-free.

2. Determine the area on the heatsink that is in contact with the CPU, and squeeze enough thermal paste into the center of the area.

3. Use a clean tool such as a razor blade, the edge of a credit card or a clean knife to pick up a little thermal paste and transfer it to a corner of the CPU core (such as the lower left corner). Note that only a small piece is enough, about the size of half a grain of rice.

4. Put your fingers into the plastic bag, and rub the thermal paste on the bottom of the heat sink with your fingers until the thermal paste is evenly spread over the entire area in contact with the CPU. Clockwise and counterclockwise motions can be used to ensure that the thermal paste fills the crevices and uneven areas on the bottom of the heatsink. Note: Do not apply directly with fingers.

5. Use a lint-free cloth to wipe off the thermal paste on the bottom of the radiator. At this time, you can see that the color of the bottom of the radiator where the thermal paste has been applied is different from that of other areas, indicating that the thermal paste has evenly filled the gaps in the base.

6. Using a razor blade or other clean tools, start from a corner of the CPU core and spread the thermal paste evenly over the entire core. The flatter the surface to be in contact, the thinner the thermal paste needs to be. For the bottom of a common radiator, the thickness of thermal paste is about the thickness of a piece of ordinary paper (0.003-0.005 inches), and if the bottom of the radiator is bright and flat, the thermal paste can be as thin as translucent.

7. Confirm that there are no foreign objects on the base of the heat sink and the surface of the CPU core, and put the heat sink on the CPU. At this time, only light pressure can be used, and the heat sink cannot be rotated or translated. Failure to do so may result in uneven thickness of thermal paste between the heatsink and CPU.

8. Fasten the buckle and call it a day.



1. The use of thermal conductive silicone grease is not as much as possible, but as thin as possible while ensuring that the gap is filled. Overcoating is not beneficial, but will affect the heat transfer efficiency.

2. Keep away from children.

3. If it touches the skin accidentally, wipe it clean, and then rinse it with water; if it touches the eyes accidentally, rinse it with water immediately and go to the hospital for examination.


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