“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.