 The study investigated the effects of thermal aging and chemical treatment on the physical properties of coir fiber, specifically the tensile strength and elongation at break. Sodium hydroxide and gluteraldehyde were used to treat the fibers for two hours, and the influence of alkali and aldehyde treatment on these properties was studied in detail. The results showed that thermal cross-linking of cellulose in the fiber increased tensile strength, while thermal degradation due to chain scission reduced it. Sodium hydroxide treated samples had an increase in tensile strength and reduction in elongation at break, while gluteraldehyde treatment reduced elasticity and enhanced strength. Scanning electron microscopy was used to analyze surface morphology changes upon chemical treatment. The study suggests that NaOH and gluteraldehyde can effectively modify coir fiber with excellent physical properties. This article was offered by our Manjula, Envy Redu, RPS Chokrador and others. We are article.tv, links in the description below.