A physicochemical model for vapor-liquid equilibria and enthalpies in formaldehyde-containing mixtures is revised and extended using recently published NMR spectroscopic data on chemical equilibria in aqueous and methanolic formaldehyde solutions as well as new vapor-liquid equilibrium data for the system formaldehyde-water at temperatures up to 413 K (pressures rip to 450 kPa), which were taken in this work with a new apparatus. Furthermore, the model is revised so that it can be extended straight-forwardly to explicitly account for reaction kinetic effects based on results from other recent NMR spectroscopic studies. The model is tested over the entire temperature range (293-413 K), where reliable experimental data on vapor-liquid equilibria are available, and against calorimetric data. Typical relative deviations between experimental data and the correlation are about 5% for vapor-liquid partition coefficients and 2% for the pressure. Deviations between calculated and measured enthalpies of vaporization are generally below 2%.