 The study investigates the morphological, mechanical, thermal characterization and activation energy of African tefstra as a potential reinforcement in polymer composites. The fiber is treated with different concentrations of alkali NaOH to improve its properties, and the effect is observed through various techniques such as Fourier transform infrared spectroscopy, scanning electron microscope analysis, x-ray diffraction, atomic force microscopy, mechanical property tester, and thermogravimetric analysis. The activation energy of untreated and treated tefstra is calculated using Flynn-Wallazower method, Kissen-Jakohairasunos method, and Friedman method. The results show an increase in tensile strength by approximately 31%, 280 to 368 mPa, and average activation energy by 21%, 136 to 164 kW per mole, in case of 5% alkali treated fiber compared to untreated one, making it a suitable reinforcement for lightweight applications. This article was authored by GL Dev Nani and Shishi Sinha. We are article.tv, links in the description below.