An approach to structural and functional modelling of the oxyfluorinated nonwovens based composite materials has been developed. The structural component of the model is presented in the form of integral and differential characteristic functions of the planar heterogeneity. The correlation analysis methods revealed the existence of links between the latex sorption capacities and the nanostructural characteristics of the experimental samples’ SEM-images. The obtained functional-structural model allows us to quantify the expected values of sorption capacities of the nonwoven fiber materials under the certain restrictions on the chemical compositions of the impregnating mixtures.