<p>This study explores the UV-induced degradation performance of aluminum fiber–epoxy composites under accelerated weathering conditions in accordance with ASTM G154. We checked how well the material works mechanically and thermally at exposure times: 0, 100 200 and 300&#xa0;h. The results demonstrate significant degradation in materials mechanical performance. The strength of the material when pulled and bent decreases by (≈ 50–56%). The elastic modulus, which measures how flexible the material is, decreases by (≈ 29%). Thermal conductivity exhibited a minor reduction (-12%). The temperature at which the materials properties change (a decline in glass transition temperature) decreases by (≈ 16.7%). This decrease happens because the materials crosslink density decreases. While the coefficient of thermal expansion increased by approximately 100%, indicating severe dimensional instability, indicating severe dimensional instability. This increase means the material becomes less stable in terms of its size. This allows us to compare how different properties change over time. The results show that the materials mechanical properties are more affected by UV light than its ability to conduct heat. The biggest long-term problem for the material is that it becomes less stable in terms of its size. The study introduces a way to evaluate how materials break down over time. This method provides insights into how materials perform and can help design new composite systems that are more resistant, to UV light. The goal is to predict how materials will behave under UV exposure and create materials that longer.</p>