This book describes the development of polymer composites with varying weight percentages of CSP/WSP (1:1) particulates and epoxy resin as the matrix material, fabricated using a hand lay-up technique resulting in six specimens. Physical properties such as density, moisture content, and dimensional stability were investigated, indicating the improved dimensional stability of CSP/WSP (1:1) reinforced epoxy composites with 2.5 wt.% particulates. The flammability behavior, flexural properties, and impact characteristics of the composites were also studied using statistical software and ANOVA to identify dominating parameters. Results showed that filler load and speed had an ascending effect on flexural properties. The composites were found to have promising physical and mechanical properties, indicating their potential for various engineering applications. The addition of CSP and WSP as reinforced particles to contribute the development of a new class of epoxy-based composites. Thisbook highlights the importance of selecting suitable materials for matrix, reinforcement, and particulate and investigating physical and mechanical properties for the development of new composite.