Nurhidayat MF, Hastuti S, Listyanda F. ANALYSIS OF MECHANICAL STRENGTH OF COCONUT FIBER WITH UNSATURATED POLYESTER MATRIX WITH VARIATIONS IN THE DURATION OF ALKALI TREATMENT TIME WITH NaOH AND KOH. Elemen [Internet]. 2026 Jul. 6 [cited 2026 Jul. 6];13(1):84-90. Available from: https://je.politala.ac.id/index.php/JE/article/view/385