ALIFF ABDUL RAHMAN; AZNIZAM AHMAD. A Comparative Study of NAK80 Steel and Beryllium Copper Moulds for Injection Moulding of Polypropylene Material. Progress in Engineering Application and Technology, [S. l.], v. 5, n. 1, p. 387–392, 2024. Disponível em: https://periodical.uthm.edu.my/index.php/peat/article/view/14578. Acesso em: 15 aug. 2026.