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