Аннотация:A method for increasing the glass transition temperature of the compositions obtained by curing an epoxy-diane resin with a partially siloxy-substituted organo(alkoxy)(zirconium)siloxane by introducing phenylsiloxane resins is considered. The initial content of zirconium siloxane was 10 wt %. It is shown that the introduction of the siloxane resins in 10–50 wt % relative to the epoxy resin is capable of not only increasing the glass transition temperature of the material almost twice, but also enhancing the curing degree of the system.