Glass Fiber Reinforced Epoxy (GFRE) composites play a huge part in practically every aspect of daily life, and the subject of glass composites has become one of the most important study topics in the last decade. To improve mechanical qualities, polymers are usually reinforced with fibers or fillers. The mechanical properties of E-glass/Epoxy composites filled with ceramic materials as filler material were investigated in this study. Composites containing varying percentages of ceramic powder, such as 5%, 10%, and 15%. The ASTM-compliant testing specimen was created using the hand layup method. The mechanical parameters of the produced composites, such as ultimate tensile strength, flexural strength, and Rockwell hardness, were investigated. The test findings show that composites with a 5% volume fraction of Al2O3 filler material had the lowest hardness and therefore highest ultimate tensile strength.