Many properties of small particle powders are significantly improved when the particle shape is spherical and the size distribution is narrow or monodisperse. By using a properly designed atomizer based on a rotating disc, perfectly spherical polymer particle with a narrow size distribution in the 20 μm to 300 μm range has been prepared directly from a polymer melt or solution. Furthermore, by using a large number of parallel discs in the same equipment, a capacity suitable for industrial scale production is possible. The polymer melt or solution is added to the rotating disk to form a thin film which is transported to the disc edge where it leaves as particles. The powder particles are formed when sufficient energy and mass is given for its formation. When the energy given by the rotation equals the energy required to create the new surface of the particle it will separate from the film and leave the disc edge. Examples such as powder coatings, chromatography media and biodegradable spheres will be shown.