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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 composites as engineering materials have gained more space in various sectors of human activity. For these materials enable a good synergy between the various components that constitute it, resulting in a range of properties inherent to the material more convenient than the individual components. The strengthening of these composite materials, plant fibers have advantages compared to synthetic fibers because they are abundant, are biodegradable by biological processes, renewable and recyclable. In this paper, polyester matrix composites reinforced by short bamboo fibers arranged randomly were produced, using the lowest possible level of technological processes in production stages. The matrix used was polyester terephthalic pre-accelerated with cobalt naphthenate and cured at room temperature peroxide, methyl ethyl ketone (MEK) in proportion to the resin of 0,33% by volume. The bamboo fibers used were extracted from the campus - Belém of Federal University of Pará.

The use of natural fibers in composite materials of plant origin involves environmental, social and economic factors that must be met. Moreover, there is a shortage of progressive energy and mineral resources in general. Leading the search for renewable raw materials and low cost, which has been the factor of significant importance in directing research involving the use of natural fibers in composites. The paper presents polyester matrix composites reinforced by short sisal fibers, randomly arranged in the mold without using technological stages of production. The resin used was polyester terephthalic pre-accelerated in relation curing agent/resin of 0,33% by volume. The sisal fibers were acquired in the local market of Belem of Para. The fibers were manually cut in lengths of 5, 10 and 15 mm, untreated and at room temperature. The fibers were characterized mechanical, physically and microstructurally.