The solubilities of methanol, ethanol, propanol, 2-propanol, butanol, 2-butanol, 2-methyl-1-propanol, acetone, methyl ethyl ketone, methyl acetate, and propyl acetate in cis-1,4-polyisoprene, polyisobutylene, poly(n-butyl methacrylate), and poly(vinyl acetate) were measured by the piezoelectric quartz crystal microbalance method at the four temperatures (293.2, 313.2, 333.2, and 353.2) K. In this work, four quartz crystals that were installed in an equilibrium cell enabled multiple solubility measurements. Estimated uncertainties of measured data were +/-0.05 K for temperatures, +/-0.9% for activities, and +/-13.9% for mass fractions in the lowest solubility region, with a lower uncertainty being found in the higher solubility region. The activities obtained were correlated by the UNIQUAC equation with an overall AAD of 5.0%.