Aldrich's PE(0.92 g/mL, M = 4000)-(5, 10 or 20%) N1 (or N2) compositions were studied as binary systems formed with test compounds (n-C-5 through n-C-10, CH2Cl2, CHCl3, CCl4, Et2O) used as solvents on Merck's 60-80 mesh Chromosorb PAW DCMS to measure Flory-Huggins chi(12)(infinity) interaction parameters at 403 K. Fillers N1 and N2 were whitings modified with silane U-15D + stearic acid and with silane U-222 + stearic acid, resp. In PE-N1(or N2)-nonpolar solvent systems, chi(12)(infinity) fell as % N1 (rose as %N2) was increased. For PE-N1, interactions with CHCl3 and n-hexane were strongest and weakest, resp. In PE-N2-nonpolar solvent systems, chi(12)(infinity) was max. with n-hexane. Interaction was strongest with dichloromethane. Generally, chi(12)(infinity) was lower with 20% N1 and higher with 5% N2. Data are inconclusive as to which filler, N1 or N2, gives the lower chi(12)(infinity), but IGC allows to establish the composition of PE-filler mixture and physical conditions to reach min. chi(12)(infinity).