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In this work the possibility of use of the built-in fiber-optical sensors (Bragg's sensors) of deformation for control of a condition of polymeric fibreglasses on binding hot hardening of ED-I were investigated. Sensors were in different layers of the layered plastic reinforced by biaxial fiber glass fabric. The package had quasiisotropic structure. The sample made by method of vacuum impregnation was affected by steam with temperature of 80 °C and relative humidity of 95% within 6 months. Operability of system of measurement has been as a result shown and swelling parameters in different layers of fiberglass are recorded.