Densities, rho, viscosities, eta, refractive indices, n(D), and excess molar enthalpies, H-m(E), of poly(ethylene glycol) 200 and 400 + dimethoxymethane and + 1,2-dimethoxyethane were determined over the entire range of composition, at 298.15 K and at atmospheric pressure. Excess molar volumes, V-m(E), viscosity deviations, Deltaeta, deviations in molar refractions, DeltaR, and excess molar enthalpies, H-m(E), were evaluated from experimental data. Deviations are negative with the exception of those of H-m(E), which are all positive. The excess or bulk properties were fitted to the Redlich-Kister polynomial to estimate the binary interaction parameters. The McAllister multibody interaction model was used to correlate the kinematic viscosities of liquid mixtures with mole fractions.