Presto ChemTech offers Saw Tooth Impellers or Dispersing Disc. Presto ChemTech offers a range of Super Impellers, Hydrofoils, Axial, Radial, etc. The Saw Tooth Impellers are used for difficult to disperse chemicals or for mixing powder into the product to form a smooth mixture. The flow pattern of the Saw Tooth Impellers produces very high shear.