Moisture absorptions of filled silicone rubber (SiR) under strong electrolyte have been investigated in the temperature range of 25-60 degrees C by weight-gain experiments. Tests were performed with the materials exposed to NaCl, HNO3 solution, and deionized water. The diffusion results have been analyzed in terms of the Fickian diffusion taw. The apparent maximum moisture content and the apparent diffusion of filled SiR in different solutions were deduced. The influences of the solution concentration and temperature on the diffusion process of filled SiR were discussed, and the microphotos of the surface of the immersed specimens were taken and analyzed. (c) 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 2253-2257, 2006