A novel latent thermal initiator, ferricenium tetrafluoroborate salt (FcBF(4)), for cationic polymerization of epoxides is reported. The activities of FcBF(4) for different epoxides, including bisphenol-A-type epoxy oligomer E44, cycloaliphatic epoxy ERL4221, and glycidylether epoxy GGE, were evaluated by differential scanning calorimetry (DSC). The results showed a moderate thermal initiation activity for E44 and GGE at 78degreesC and 108,C respectively. When adding GGE to E44, the reaction was enhanced. The temperature of thermal degradation of the cured specimens for the system of E44/FcBF(4), E44+10%GGE/FcBF(4) and E44+10%ERL4221/FcBF(4) is higher than 350degreesC.