Useful for blending PVC resin and additives into dry blended compounds with combined mixing and heating of compound. Double vessel construction with S.S inner vessel and M.S outer jacket. Provision is made for circulating cooling medium like water or oil. Material feeding hopper is provided. Sight glass window is provided in the domed lid. Mixing cycle is controlled by timer and temperature controller arrangement with temperature sensor. Alongwith cooling action from the cooling jacket, this results in a fine blend without overheating.