“Study of the effect of adding (TiO2) on some mechanical and thermal properties of polyvinyl chloride (PVC) pipes exposed to sunlight: no”, مجلة العلوم الهندسية, vol. 41, no. 1, Feb. 2025, Accessed: Jun. 18, 2026. [Online]. Available: https://journal.damascusuniversity.edu.sy/index.php/engj/article/view/7079