Dow Corning Corp. (Midland, Mich.) has introduced Z-6173 filler dispersion aid, a multifunctional siloxane designed to improve filler dispersion and increase compatibility between materials. It contains alkoxy- and alkyl-functional groups to improve the dispersion of inorganic fillers into organic polymers, such as resins, plastics and rubber. The alkyl also acts as a hydrophobe to reduce water absorption. The dispersion aid is suitable for use with silica, mica, wollastonite, glass and natural fibers, talc, calcium carbonate, ferrous metals, carbon microfibers and many others. It requires no prehydrolysis or catalyst, generates lower levels of methanol than conventional monomeric silane coupling agents, works in wet and dry processes and reduces the viscosity of the molten compound in the mixer, thereby increasing throughput and reducing the amount of energy needed for extrusion.