The dielectric behavior of composite materials (epoxy resin - barium titanate and epoxy - CCTO) was analysed as a function of ceramic amount. Composites were prepared by mixing the components and pouring them into suitable moulds. In some compositions, the matrix was reduced by tetrahydrofuran (THF) incorporation. Samples containing various amounts of ceramic filler were examined by TG/DTA and scanning electron microscopy analysis. Dielectric measurements were performed from 20 Hz to 1 MHz and 30 to 120 °C. It was demonstrated that the epoxy - CCTO composites possessed higher permittivity than classic epoxy - BaTiO3 composites. However, the low resin permittivity prevailed in the composite dielectric performance.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Univ Mar del Plata, Natl Res Council Sci & Technol Argentina CONICET, Inst Res Mat Sci & Technol INTEMA, Mar Del Plata, Buenos Aires, ArgentinaUNESP, Inst Chem, BR-14800900 Araraquara, SP, BrazilChemistry Institute of São Paulo State University - UNESP, Bairro Quitandinha, 14800-900 Araraquara-SP