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. JTIRE. 2026;1(1):34-38. Accessed August 9, 2026. https://journal.grahawidya.org/index.php/tire/article/view/19