Two different PVC formulations were extruded in a single screw extruder with the same screw speed and different processing temperatures. The gelation level of different extrudates were analyzed by differential scanning calorimetry, capillary rheometry and solvent absorbtion techniques. The methods were compared qualitatively and quantitively. The differential scanning calorimetry method appears the most accurate method for determining the PVC gelation degree with very small sample usage. The capillary rheometry has accurate results as well but could be inaccurate because of the temperature rise during the test. The temperature rise changes the viscosity of the material non-linearly and the gelation curve could have inaccurate results. The solvent absorbtion method is simply applied but only gives qualitative results when compared with the other two methods. Ultimate tensile strength, elongation at break, solid density and color change were also measured and compared for different samples processed at different temperatures. The extruded specimens have satisfactory properties for both PVC resins between 60%-90% gelation degree.