Performance Testing of Thermal Adhesives

Performance Testing of Thermal Adhesives and its Importance

Performance testing of thermal adhesives is a critical process for electronics and construction applications. Thermal adhesives are used to improve the thermal management of an electrical system/enclosure, bind heat-generating components to heat sinks/spreaders, apply underfill to PCBs, and encapsulate components. Thermal adhesives are a subset of thermal interface materials packaged as binding agents and contain high concentrations of thermally conductive fillers such as ceramics, metals, or inorganic particles. Therefore, it is essential to evaluate the performance of thermal adhesives to ensure they meet the desired requirements.

Two of thermal adhesives’ most important performance characteristics are thermal conductivity and contact resistance. Thermal conductivity is a measure of a material’s ability to conduct heat and is determined by the adhesive material and the amount of filler used. The higher the thermal conductivity, the better the heat transfer through the adhesive bridge. Contact resistance is the ability of the adhesive to remove air from the surfaces of the substrates, and it is usually evaluated by the ability of the adhesive to deform due to contact pressure. By carefully considering the adhesive’s application requirements and performance characteristics, the optimal adhesive can be selected.

Read more: ASTM D5657 Fluid Tightness Ability of Adhesives (Using Threaded Fasteners)