Saputra A, Sitinjak TM, Warmiati, Hermiyati I, Ratnaningsih W, Hariyadi A, et al. Study of the Effect of Ultraviolet Exposure Duration on Polypropylene Properties. j. sains materi indonesia [Internet]. 2025 Aug. 31 [cited 2026 Jan. 31];27(1):11-8. Available from: https://ejournal.brin.go.id/jsmi/article/view/8959