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 [Internet]. 2026 Jun. 30 [cited 2026 Aug. 9];1(1):34-8. Available from: https://journal.grahawidya.org/index.php/tire/article/view/19