AbstractExpoxy bisphenol‐A resins (A), epoxy novolac resins (B) and epoxy furfuryl alcohol resins (C) were prepared using different molar ratios of epichlorohydrin and the respective hydroxy compounds. These resins were cured with different hardeners, namely diethylenetriamine (DTA), dithioterephthalic acid (DTTPA), mercapto succinic acid (MSA), and phthalic anhydride (PA). The thermal behaviour of the cured epoxy resins was studied. From the energy of activation data and IPDT values it was concluded that DTTPA gave the highest thermal stability of all these curing agents. Dielectric constant measurements of the cured resins were also made at 30°C and at frequencies 1 kHz and 10 k