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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.

The natural fibers presents an intense target of research by the scientific community, they're an interesting option of reinforcement for polymeric matrix composites, due to their good properties of tensile resistance and flexibility; also, their low cost, easy accessibility and biodegradable characteristic, motivates studies about their applicability on industry and materials science. The objective of this study is to manufacture plates shaped polyester matrix composite, reinforced by jute fiber and fiberglass blanket for tensile test. Results and discussion about the properties the reinforcements attributed for the composite are compared to others composite materials. The fibers were cut in length of 10 mm and 50 mm, and blankets of random organization were made of them. They were used as the only reinforce of the plate, or together with fiberglass blankets.