Int. J. Adv. Sci. Eng. Vol.11 No.4 4591-4609 (2025) 4591 E-ISSN: 2349 5359; P-ISSN: 2454-9967 Govinda et al., International Journal of Advanced Science and Engineering www.mahendrapublications.com Natural Fibers Reinforced Polymer Composite: Focus on Mechanical, Tribological and Biodegradable Properties Govinda 1 , Chingakham Chinglenthoiba 1 , Jitendra Kumar Katiyar 1* 1 Centre for Research Impact and Outcome, Chitkara University, Rajpura- 140401, Punjab, India INTRODUCTION Natural fibers reinforced composites (NFRCs) have gained attention as sustainable alternatives to synthetic materials in various industries, including automotive, aerospace and construction [1]. Natural fibers combined with epoxy, polyester, polypropylene etc., to make components like automotive door panels, seat backs, bumpers, roofing, etc. Natural fibers are produced from plants, animals and minerals and are identified for their biodegradability and renewable nature [2]. Natural fibers used to increase the strength of polymer matrix with reduction in weight of composite. An appropriate number of natural fibers are added to the polymer for good strength. Natural fibers polymer composites can be a potential replacement for synthetic fibers in the composite material area [3].The scarcity of non- renewable resources has led to a dependence on renewable resources. The natural fibers extracted from living plants are renewable and sustainable. There are two types of natural fiber: primary and secondary fibers. Primary fibers are those unprocessed natural fibers extracted directly from nature, like cotton, jute, wool etc. Secondary fibers are those fibers that have already been used or recycled [4].Composites are made from two or more different materials to form a new material having properties superior to each material used in the composite. Polymer Matrix Composites are those composites where a polymer matrix mixed with fibers to increase their mechanical properties [5]. Polymer matrix composites are widely used because they are lightweight and have a great strength-to-weight ratio. Polymer matrix composites are not very costly and easy from manufacturing point of view. The properties of polymer matrix composites can be achieved by varying the type of polymer matrix, fabrication process, and reinforcement fibers for the required properties [6].Metal matrix with ceramic or other reinforcing particles enhances properties such as wear resistance and thermal conductivity. Ceramic fibers embedded in a ceramic matrix, offering high-temperature resistance and low density generally used in turbine engines and high-temperature application [7]. Carbon-carbon composites are advanced materials made from carbon fibers inserted in carbon matrix. These composites are known for their exceptional properties, especially at high temperatures. Carbon-carbon composites can withstand extremely high temperatures, often exceeding 1000°C [8]. This review paper aim is to discuss the mechanical properties of composites fabricated in research studies by single natural fiber or dual natural fibers reinforcement in epoxy and single natural fiber reinforcement in polypropylene and ABSTRACT: Interest in creating sustainable materials, such as natural fiber-reinforced polymer composites, for various industrial applications has increased due to the depletion of petroleum resources and environmental concerns. Natural fibers are strong and enhance the mechanical strength of polymer matrices through their inherent strength, adhesion to polymers, effective load transfer, damping properties, density reduction, and sustainability benefits. This review study discusses the mechanical properties, tribological properties, and moisture absorption of epoxy, polypropylene, and polyester matrices reinforced with different natural fibers, as well as their applications in various industries. This review also covers mechanical characteristics for natural fiber composites, including dual fiber composites, their impact, tensile and flexural strengths, and hardness from research studies. KEYWORDS: Natural fiber, polyester, polypropylene (PP), epoxy, tribological, biodegradability, moisture absorption https://doi.org/10.29294/IJASE.11.4.2025.4591-4609 ©2025 Mahendrapublications.com, All rights reserved *Corresponding Author: jitenderkumar.katiyar@chitkara.edu.in Received: 10.03.2025 Accepted: 20.04.2025 Published on: 23.06.2025