 The study investigates the thermo-mechanical behavior of polyester matrix composites reinforced with micron range coir fillers using hand layout method, and finds that the mechanical properties are enhanced with maximum filler reinforcements. Dynamic mechanical analysis, DMA, and field emission scanning electron microscopy, PHISM, were used for testing and characterization, while DL's particle size analysis showed an average size of coir microparticles to be 0.255M. This article was authored by NB Karthik Babu, S. Mutakumaran, S. Orokyosamy, and others.