FR-406 is a type of PCB material offered by Isola, a company specializing in the PCB industry. It is an epoxy-based resin system that provides enhanced thermal characteristics compared to standard FR4 materials. FR-406 has a thermal conductivity of 0.4 [W/m*K], indicating its ability to efficiently conduct heat. It also has a glass transition temperature (Tg) of 170°C, which means it can maintain its mechanical structure better at higher temperatures.