The book offers a direct comparison of general-purpose fillers (micron-size fillers) and nanofillers. The first section covers the grades of fillers available in the world market, dividing them into eight groups and analyzing their properties, applications, and sources. The second section discusses the effects of filler incorporation with ten chapters covering the mechanical properties of compounded materials, the effect of the filler on the material rheology, the morphology of the filled system, the material durability, flammability and recycling, the structure of interphase, chemical interphase, chemical interactions, interaction with and effect on other additive, fillers use in material compounds, and the analytical methods of testing fillers and filled materials. The final section is devoted to the application of fillers on an industrial scale. Filler transportation, storage, processing, and equipment used for these purposes are discussed, as are quality control of fillers, formulation with fillers, different processing methods, and health and safety issues.