Analysis of sorption/desorption and diffusion kinetics of ketones and nitriles at 25, 44, and 60 degrees C into three Du Pont’s VITON fluoropolymer membranes loaded with different amounts of carbon black has been undertaken by use of a sorption/desorption technique. The transport results are affected by the percent loading of carbon blacks. Diffusion coefficients have been calculated from Pick’s equation. These results show a decrease with increasing amount of carbon black. Experimental results have been analysed by considering swelling of the membranes. Sorption/desorption results have been analysed from a calculation of the concentration profiles, which are obtained from the analytical solution of Fick’s equation. These results have been compared with a numerical solution based on the finite difference method.