The water-soluble bacterial polysaccharides are used by industry as emulsifying, stabilizing, thickening and suspending agents, and eventually for their gelling properties. It has been observed that several of these properties may be influenced by the presence of disordered intermolecular associations (aggregates or microgels). The influence of aggregates on the sedimentation properties of welan gum were investigated by means of the falling sphere method. The velocity of the particle sedimentation is affected by the type and size of the aggregates.