 The study investigates the mechanical, water absorption, and fire resistance properties of basalt rock fiber, BRF, and pineapple leaf fiber, PLF, reinforced polyester composite panels at different fiber volume fractions ranging from 10 percent to 45 percent. Results show that the mechanical properties increased with up to 40 percent FVF for BRF, the polyester, and 30 percent FVF for PLF polyester composites, while the linear burning rate was decreased. The study also found that BRF, or polyester composites, are hydrophobic, while PLF, or polyester composites, are hydrophilic. This article was authored by B. S. Kithygoda, K. Naresh, S. Langovan, and others.