Scrutinizing various fillers, such as fly ash, inorganic nanoparticles, Kevlar and wood flour, this book exemplifies how the choice of filler influences the micro- and macroscopic behavior of the resulting polymer composites, such as friction, wear and impact resistance. In so doing, the text brings together a number of composite systems using different polymer matrices, different filler systems as well as different processing conditions, thereby serving as a beneficial guide for readers so as to select a particular set of processing conditions or composite constituents for the enhancement of certain properties.