Handbook of Impact Modifiers, Second Edition provides key information on how to modify structure and morphology, improve mechanical performance, and prevent changes during the use of polymeric products through proper selection of impact modifiers. The book analyzes the chemical origins of impact modifiers and their associated properties, highlighting fundamental differences among the modifier classes. Three chapters are devoted to selection guidelines and performance outcomes across different polymers, end-use products, and processing methods, drawing extensively on patent-literature and application-focused research, offering practical insights directly relevant to industrial formulation and product development. This handbook contains the essential theoretical knowledge required for proper selection and use of impact modifiers, including their morphological structure and distribution in a polymer matrix, the effect of polymer crystallization in the presence of and without impact modifiers, important influences on impact modification, mechanisms of modification, and effective methods of incorporation of impact modifiers.