The elastomer industry is ever growing providing advancements in technology thermal management technology. Of interest in this study is the addition of filler particles to such elastomers. The process of adding filler particles to an elastomer most often involves the effort to increase the thermal properties of the component. Upon the addition of filler particles, a specific filler orientation, whether intended or not, is most often attained. With fibers oriented in specific directions, anisotropy – differing directional thermal properties – becomes an apparent trend. Quantifying the exact disparity in the directional properties is vital to ensuring the proper function of the elastomer in its end application.
For the purpose of this study, filled elastomers, specifically silicone elastomers, were analyzed for their anisotropic nature. Techniques such as the Hot Disk Transient Plane Source technique (ISO 22007-2.2), and the Guarded Heat Flow Meter (ASTM E1530) were used to determine the thermal conductivity of various filled elastomers. Comparisons between various testing modules of the Transient Plane Source technique, as well as the through-thickness measurements of the Guarded Heat Flow Meter, provides the necessary tools for determining the degree of anisotropy of the tested elastomers.