At this point of time, the plastic powders have already formed a uniform melt structure. The mold is then cooled to room temperature, without stopping the rotation, until the part is fully solidified. Finally, the mold is opened and the formed part is removed. Although rotational molding has similarities with the centrifugal casting, the rotational molding is a distinct and unique process. The most important difference between the two is the magnitude of the rotational speed that is applied on the mold during the process.
Rotational molding is characterized with much lower rotational speeds than the centrifugal casting.
Therefore, as opposed to the centrifugal casting, the plastic particles remain at the bottom of the rotating cavity of the mold, due to the gravity. As a result of the higher range of rotational speeds applied, in centrifugal casting, a significant centrifugal force is developed. This is why, in centrifugal casting, the melted material became forced to flow in the radial direction in the mold. As the temperature increases, a uniform plastic melt structure is formed.