Pengaruh Kosentari Natrium Hidroksida Terhadap Ketangguhan Komposit Polyester Berpenguat Serat Serabut Kelapa: Effect of Sodium Hydroxide Cosentration on The Toughness of Polyester Composites Reinforced with Coconut Fiber. (2026). Journal of Technology, Innovation and Reseach in Engineering, 1(1), 34-38. https://journal.grahawidya.org/index.php/tire/article/view/19