Thermal Conductive Board (TCB), or Insulated Metal Substrate (IMS), provides the advantages of high thermal conductivity, reliability and thermal resistance. TCB is a sandwich structure, which includes layers of copper foil, insulator, and base metal. Traditionally, this insulator is made of epoxy, epoxy filled glass fiber, polyimide, or other dielectric materials. However, these kinds of insulators could not meet the requirement in high-power electronic devices. The heat generated by these devices will accumulate, and the life time and reliability of the end product will decrease.

Polytronics TCB is not only a printed circuit board but also a heat transfer-interface. The insulator is made by a unique polymer composite that combine epoxy resin and high thermal conductivity filler, and the thermal conductivity is about 5 times higher than the traditional epoxy filled glass fiber system.