The applicability of a linear partition model, which correlates elastomer swell in equilibrium with mixed solvents, is extended to include solutions that exhibit significant self-association and also cross-association among the constituents. Combined with Chemical Theory to characterize the behavior of associative solutions, the linear partition model conveniently accounts for both positive and negative excess absorption by elastomers over the entire solution composition. The method requires thermodynamic activity data for each component as a function of concentration, a rational model for the nature of chemical association and one observation of elastomer swell for each chemical species in solution. Prior knowledge of the chemical structure of the elastomer is not required.