Heat transfer is a science to predict the energy transfer in the form of heat that occurs due to a temperature difference between objects or material. A material that can conduct heat well known conductor while the less well known insulator. Thermal conductivity is a function of temperature will increase slightly if the temperature rises but little variation, so often diabaikan.Dalam this research is focused on determining the constant value or the value of the thermal conductivity of a composite material of polyester resin with the addition of particles of montmorillonite (MMT). The addition of montmorillonite particles is accomplished by variations in particle size, in the hope of reinforcing composites with montmorillonite particles having insulating properties and good heat resistance. The method used is the hand lay up. Variables used include variations in particle size with a mesh size of 20, 40, 60, 80, 100, 120 and 150. From the research results of thermal conductivity values. Optimal thermal conductivity value of the composite at 14 mW / MOC, the mesh size of 60. The market value of the thermal conductivity of the composite minimum of 4 mW / MOC, the mesh size of 20. The value of the thermal conductivity of the composite is below the thermal conductivity of a control sample (without addition montmoriilonite particles). From the data analysis, it can be concluded that semkin larger particle size, the better the inhibiting heat and strength of the composite stronger than the control sample.
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