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Composite materials are alternative materials that come rising fast at last decades. With a view to the use of lighter and stronger materials that can replace ferrous materials, arise composites reinforced by synthetic fibers. Moreover, natural fibers emerge as an alternative reinforcement for the synthetic fibers because they are costly. Thus the present study aims to evaluate the behavior of particulate composite reinforced by sisal fibers in the size of 15 mm emerged in fluids such as water, salt water, and lubricating oil. The specimens were made according to ASTM D638M and aging it period of sixty days. After two months, the specimens were subjected to tensile tests, and determined the tensile strength results and deformation of the maximum load and the modulus of elasticity. In general, it was observed a reduction in tensile strength of the particulate sisal composite when immersed into the lubricant oil.

The use of composite materials reinforced with natural fibers has been widely studied in recent research seen the availability of feedstock and mainly because the productions facility, low cost and because they are biodegradable. In order to expand the applications of composite materials, this paper proposed to develop hybrid laminar composites associating natural fibers as jute, sisal and curaua in an array of type resin polyester and compare them with commercial bumpers available on the market. The sisal and curaua fibers were manually cut into lengths of 50 mm and then were arranged and incorporated separately with the polyester resin and the jute fiber cut, as a blanket in length 400 × 400 mm2 adopting for that a simple and manual manufacture process. Finally, it was executed a tensile test in hybrid laminated, and then a comparative study of tensile properties of different laminated hybrid composites, jute-sisal, jute-curaua and between the results of the commercial bumpers.