Fibrous plants are available in abundance in nature and are renewable resources. The development of high performance composites from a cheap natural fiber, such as water hyacinth (Eichhornea crassipes) is particularly beneficial from an economic point of view. For this study, some composites from water hyacinth fiber and high density polyethylene were prepared using compression machine and two roll mill of DOST-ITDI MSD (materials science division). The composites were prepared by varying fiber percentages (0, 10, 20, and 30 wt%). Additionally, The DOST-ITDI standards and testing division

STD evaluated the mechanical properties of waterhyacinth (Eichhornia

crasippes) by subjecting the concentrations to physical tests. Physical properties such as flexural strain, compression strength, density and water absorption of the different composites were analyzed. Thus, composites which had a concentration of water hyacinth of 30% yielded the best results. Additionally, the analysis showed no evidence of a negative effect on mechanical properties of the composite by addition of water hyacinth fiber to the High Density Polyethylen composite. Furthermore, the results showed that water hyacinths fibres presented a competitive reinforcement quality when they were compared with pure polyethylene.