Mei Hyie, Koay, Anizah Kalam, and Muhammad Basyar Bin Ramli. “Effect of Injection Molding Parameters on Mechanical Properties of Keychain Made of Recycled Polypropylene”.
International Journal of Engineering and Technology 7, no. 4.18 (November 27, 2018): 237–241. Accessed April 28, 2025.
https://sciencepubco.com/index.php/IJET/article/view/21925.