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How to judge the pros and cons of thermal grease


Thermal grease may seem inconspicuous, but it plays a very important role in most thermal management systems. Just like a million-dollar luxury car, if there is no tire as the driving medium, no matter how powerful the engine is It is impossible to achieve the high performance of the car. Thermal grease is a thermal medium that acts as a bridge between the chip and the heat sink. However, with the introduction of many thermal grease products, the price difference is huge, which creates a distinction between high-end and low-end. However, many users are confused about the specific difference between the two. Today, I will explain it to many users in detail. How to judge the pros and cons of thermal grease.


Three main parameters affect the performance of thermal grease

1. Thermal conductivity: The higher the thermal conductivity, the better the performance of the silicone grease, of course, the price is more expensive.

2. Thermal resistance: In thermal grease, the smaller the thermal resistance, the better the heat transfer effect.

3. Oil separation rate: Generally speaking, the lower the oil content of thermal grease, the better, because the silicone grease with high oil content will separate some grease after a long storage time, and these greases will hinder the heat conduction to a certain extent.


Raw materials that affect the performance of thermal grease

Silicone oil is the base material in the production of thermally conductive silicone grease, which has good waterproof sealing, water resistance, solvent resistance, and anti-crawling properties. In fact, whether it is high-end or low-end thermal grease, the silicone oil used is not much different, because the silicone oil itself is a pure insulator, and its thermal conductivity is very poor. Then the main difference between high-end and low-end thermal grease in raw materials is the various types of metal compounds that can enhance the performance of silicone grease. Generally, ordinary thermal grease will generally add substances such as alumina, and the price and more high-end boron oxide, sterling silver, and other substances are usually only used in high-end silicone grease.


In fact, it is difficult for us to distinguish the difference between the pros and cons of thermal grease with the naked eye, but if we analyze it from the perspective of use, we can see the difference very clearly. In addition to the thermal conductivity of the silicone grease, there are also the viscosity factor, thermal resistance, and the degree of oil separation, all of which have a direct effect on the use of the silicone grease, and these effects can be analyzed by professional testing instruments or equipment to find out the specific performance parameters of the silicone grease. For example, the oil separation rate will affect the life of thermal conductive silicone grease. When the oil separation speed of the silicone oil in the silicone grease is too fast, the silicone grease will dry out, which will lead to a gap between the value and the interface, reduce the thermal conductivity area, or the medium will react with the air and change the nature of the silicone grease itself to reduce the performance. Therefore, the service life of silicone grease and whether the physical and chemical properties are stable are also important indicators for judging the pros and cons of thermal grease.


When we purchase thermal grease, we should not only look at the performance of the product but also choose a trusted brand of thermal grease. Here, we recommend a thermal grease TS1101 independently developed and produced by TENSAN, which has the characteristics of high viscosity, no solvent, easy operation, thermal conductivity of 4.5W, and extremely low oil separation rate, low thermal resistance, and excellent thermal conductivity. Used in lighting assemblies, telecom equipment, consumer electronics, power supplies and power components for transportation, etc.


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