For results of in-flight experiments of polymer composite materials (PCM) that have been used in construction of the micrometeor protection on space station "Mir" and on new space station "Alpha" the detailed mathematical analysis has been carried out. Measuring data of mechanical properties, mass loss, dynamic mechanical analysis, microhardness, diffusion analysis, optical and scanning electron microscopy were used for analysis. New criteria of the state of the binder in composites (the boundary of the glass transition temperature and the value of the temperature derivative of dynamic shear modulus and Young modulus) defined from the dynamic mechanical spectroscopy developed by authors are suggested. The computer analysis of the surface images of PCM after different terms of exposure in the space was conducted. The correlation between the state of the surface and its macroscopical properties including the moisture diffusion coefficient and microhardness has been discovered. By means of computer analytical methods the forecast for the changes of the complex properties for long duration term was given. For fifteen-year exploitation of the micrometeor protection constructions on LEO stations with using of recommended carbon fiber reinforced plastics the durability was guaranteed.
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