KHAN, N. A.; AHMAD , H.; SYED, . N. U. H. .; 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 . University of Wah Journal of Science and Technology (UWJST), [S. l.], v. 8, p. 1–13, 2024. Disponível em: https://uwjst.org.pk/index.php/uwjst/article/view/158. Acesso em: 25 jun. 2025.