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The banana is among the most economically important crops for tropical and subtropical countries, where they have currently having great use in craft production, but it has been studied by many researchers to turn it into a high quality material for engineering. The extraction of the fibers of the banana pseudostem was done manually and without any chemical treatment. The fibers used in this study were drawn from the middle region of the pseudostem (trunk) of São-Tomé banana. They were characterized for their tensile strength, diameter, density and moisture content. The materials used for manufacture of polymeric composites were banana fibers, manually extracted from the pseudostem of São-Tomé banana (Musa sapientum, Musaceae), and an array of resin tereftálica unsaturated polyester and pre-accelerated chosen from the proportions of a 0.33% (v / v) 1.66% (v / v) 3.33% (v / v) and 5% (v / v) which was initially studied.

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.

There's an intense growth on the study and development of new materials in recent years, especially in the category of materials that are less harmful to the environment and, moreover, have a low production cost. Following this tendency, composites reinforced with natural fibers that can replace satisfactorily a wide variety of materials have been produced. This work aims to study the properties presented by aplateshaped composite when reinforced by a fiberglass blanket with jute/sisal fibers in different lengths, produced in accordance with ASTM D3039 standard. The composite was produced by hand-lay-up process overlapping jute, sisal and fiberglass layers impregnated with polyester resin, placed in a hydraulic press under a 500 kg load. Specimens in accordance with ASTM D3039 were extracted and tested according to its procedures.