STUDY THE EFFECT OF POLYPROPYLENE FIBERS IN SOME MECHANICAL AND PHYSICAL PROPERTIES OF RIGID POLYURETHANE FOAM COMPOSITES. Journal of Engineering and Sustainable Development, [S. l.], v. 20, n. 4, p. 71–87, 2016. Disponível em: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/581.. Acesso em: 5 may. 2024.