It is well known that many changes are effected on the physical properties of plastics by the addition of fillers. The purpose of this paper is to present thermal conductivity data of amorphous resin filled with various inorganic crystalline substances and to compare these data with those of partially crystalline polymers. Binary mixtures of amorphous and crystalline components are pre-pared by adding powdered fillers to polyester resin of ethylene glycol and maleic acid cross-linked by styrene, and their thermal conductivity is measured by the steady-state method in the temper-ature range of approximately 20 to 100°C. The fillers used are Al
2O
3, Alundum, CaF
2, graphite, Al and Cu. The thermal conductivity of the systems increases with increase of the content of crystalline component. The results are discussed by analogy with the electrical resistivity of-multicomponent systems. It is difficult to find a simple relation which can predict the conductivity of the composite system by the conductivity and amount of each component. The temperature. dependence of thermal conductivity of the systems filled with Al
2O
3 and Alundum of various particle, sizes are compared with that of partially crystalline polymers.
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