In an era where sustainable manufacturing and material optimization are paramount, this book presents a comprehensive investigation into the utilization of Linz-Donawitz (LD) sludge as a reinforcing material in polymer composites. Through rigorous statistical approaches, including Taguchi experimental design and response surface methodology, this work bridges a critical gap in industrial waste management and advanced materials development. The book meticulously examines the physical, mechanical, and tribological properties of LD sludge-filled epoxy and polypropylene composites, offering valuable insights into their wear characteristics and performance optimization. By combining theoretical modeling with practical applications, this study provides industrial engineers, materials scientists, and sustainability professionals with essential knowledge for developing wear-resistant composites while addressing the crucial challenge of industrial waste utilization. The systematic analysis of wear behaviors makes this work an indispensable resource for both academic researchers and industry practitioners seeking innovative solutions in composite engineering.