Though a large number of nanocomposites prepared by solution process has been reported in the literature, effect of solution concentration on properties of the nanocomposites has not been studied. In the present work, new fluorocarbon- clay nanocomposites were prepared by a solution mixing process. Characterization of the nanocomposites was done with X-ray diffraction technique and atomic force microscopy. Effects of different rubber-solution concentrations (5, 10, 15, 20, and 25 wt %) on the mechanical and dynamic mechanical properties of the resultant nanocomposites were investigated. Optimum properties were achieved at 20 wt % solution. The data could be explained with the help of structure of the nanocomposites and dispersion of the clay. (c) 2006 Wiley Periodicals, Inc.