Khan NA, Ahmad H, Syed NUH, Ahmad B, Khan S, Ismail H. The use of Fly ash as a cheap filler medium in order to cut the production cost of the Unplasticized polyvinyl chloride (rigid) pipes, though maintaining the strength and the finishing quality . UWJST [Internet]. 2024 Dec. 30 [cited 2025 Sep. 29];8:1-13. Available from: https://uwjst.org.pk/index.php/uwjst/article/view/158