Insulation sealing thermal silicone - thermal conductivity 1.2- How often to change the heat dissipation silicone

How often do you change the cooling silicone

Under normal circumstances, when the cooling silicone is not loose, it can be replaced once every 2-3 years. However, if the computer has not changed the thermal grease for a long time, after removing the radiator, the radiator base and the chip surface will remain old silicone grease, generally these silicone grease has been denatured and hard, and they must be removed before applying new silicone grease. You are advised to apply it on one side of the CPU. It can be slightly thicker.

Thermal silicone is a material used for heat dissipation, and its main role is to fill the gap between the radiator and the processor to improve the heat dissipation effect. Under normal circumstances, the cooling silicone does not need to be replaced regularly, as long as the good heat dissipation effect is maintained.

However, if you find that the cooling silicone appears aging, dry or begins to fall off, you need to consider replacing the cooling silicone. In addition, if you replace the processor or heat sink, you should also re-use the new heat dissipation silicone to ensure the heat dissipation effect.

In general, there is no clear fixed time for the replacement frequency of thermal silicone, which needs to be determined according to the specific situation. If you are worried about whether your cooling silicone needs to be replaced, you can check regularly and judge according to the actual situation. If necessary, you can consult a professional or refer to the relevant user manual for more accurate advice.


Insulating sealing thermal silicone

Thermal insulating silica gel is a special thermal conductive material, which has the dual characteristics of thermal conductivity and insulation properties. It can be used to fill the gap between components such as electronic devices, radiators and cooling modules to achieve thermal conductivity and insulation purposes.

Insulating sealing thermal silica gel is generally composed of silica gel and filler, and the filler is usually a material with good thermal conductivity, such as aluminum powder or ceramic particles. These fillings can improve thermal conductivity, and the insulating properties of silica gel can prevent the flow of current to ensure the safe operation of the device.

When using insulated sealing thermal gel, clean the surface to be coated to ensure that it is clean and dust-free. Then, evenly apply thermal silica gel to the gap to be filled so that it is in full contact with the surface. Finally, install the component to be filled and apply appropriate pressure to ensure that the cooling silicone can fully fill the gap.

It should be noted that different insulating sealing thermal silicone has different requirements and performance characteristics, so when selecting and using, please refer to the product manual or consult professionals to ensure the use effect and safety.


Electrical/mechanical properties (At TA=25℃)

Argument Symbol Test standard Performance index
Hardness shore A


GB/T 531.1


Elongation %


GB/T 528


Tensile strength MPa


GB/T 528


Shear strength MPa


GB/T 7124


Dielectric strength kV/mm


GB/T 1695


Dielectric constant 1.0MHz


GB/T 1693


Volume resistivity Ω·cm


GB/T 1692



Limiting parameter number (AtTA =25℃)

Argument Symbol Numerical value
Table drying time min



Curing time H



Thermal conductivity W/m·K



Specific gravity g/cm³



Operating temperature


-60°C To +260°C

Storage temperature


 10°C To +25°C 


Thermal sealing silicone applicable range

Heat transfer silicone can be widely coated in a variety of electronic products, electrical equipment in the heating body (power tube, thyristor, electric heating pile, etc.) and heat dissipation facilities (heat sink, heat strip, shell, etc.) between the contact surface, heat transfer media. Suitable for microwave communication, microwave transmission equipment, microwave special power supply, voltage regulation power supply and other microwave devices surface coating or integral potting-sealing, such silicon materials for heat generation of electronic components, provide excellent heat dissipation and thermal conductivity effect. Such as: transistors, CPU assembly, thermistors, temperature sensors, automotive electronic parts, automotive refrigerators, power modules, printers and so on.


Thermal sealing silicone product standard

◆ In line with GB 33372-2020(VOC) volatile organic compounds certification, ◆ in line with REACH EU testing standards, ◆ enterprises through the flame retardant grade UL certification E358706◆ISO14001:2015 certification, ◆ISO9001:2015 certification, ◆ reference standard: HG/T3947-2007 Single component room temperature vulcanized silicone adhesive/sealant ◆ Passed the national high-tech enterprise certification ◆ Our products have passed 1000 hours of cold and heat shock test, 1000 hours of double 85(high temperature and high humidity) test, 1000 hours of high temperature aging test, committed to providing reliable heat and heat transfer solutions for automotive, communications, security and other industries.

Environmental requirements: comply with RoHS directive and related environmental requirements

Citation standard :HG/T 3947-2007 single component RT-vulcanized silicone adhesive/sealant

Product description

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