Dispensing Thermal Gap Fillers

Special dispensing technology ensures high precision and reliability

Thermally conductive gap fillers are increasingly being used in automotive production and in the electrical and electronics industry. They are used in the production of circuit boards, sensors or LEDs as well as in batteries for electric vehicles. Thermal gap fillers serve an important purpose in all applications: they continuously cause the resulting heat to dissipate from the components and prevent them from overheating at the same time.

Thermal gap fillers are a highly viscous and abrasive material that hardens at room temperature. Production of the material is based on silicone or PU, although the trend is going more towards silicone. Its application may be more expensive, but is more stable. Thermal gap fillers have a high percentage of fillers, which is responsible for their thermally conductive properties. The filler particles – for example, aluminium oxide – have to touch each other in order for the heat to be transferred. The higher the percentage of fillers, the higher the density, meaning that the resulting heat can dissipate even better. Even though the materials are continuously refined, many are still highly abrasive.

Using thermal gap fillers therefore leads to more advanced metering technology requirements. This means that the metering system is subjected to increased wear and important components have to be protected using special coatings to combat this, for example, with tungsten carbide. DOPAG has equipped the vectomix metering and mixing system with a coating to prevent wear especially for these requirements. The vectomix can be integrated into automated production processes and enables thermal gap fillers to be reliably and precisely metered.

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