The characterization of plastic/resin polymers in solvent mixtures is important during their production and finished states. The Phase Technology analyzer can be used to elucidate the phase transitions in these samples. The temperature range under which the samples are transformed from being clear to cloudy, opaque, or otherwise precipitate out of the solution mixture may be clearly delineated. For example, the phase plot below illustrates the cloud point of a plastic polymer at 10% dilution in solvent. The mixture is heated at a fast rate from room temperature until it becomes clear at elevated temperatures (above 60°C). Subsequent cooling at a slow and constant controlled rate shows that the polymer turns cloudy at about 50°C.