Automotive electronic devices increasingly facing challenges of heat transfer problems, getting smaller and smaller because the engine compartment, and the number of components accommodated but increasing engine power output higher than ever, so that they cause the front cabin air temperature . Meanwhile, the electronic device itself functions and power are increasing, the heat generated will be increased. And because the heat loss is the determining factor of performance and reliability, and therefore, people will focus on these electronic devices is thermal interface material (TIM). Silicone has a unique set of physical and electrical properties, which can effectively promote cooling. Silicone TIM diverse forms, including adhesives, gels, potting agent, caulking, gaskets and fabricated phase-change materials.