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Maintenance of oil and gas pipelines presenting corrosion damage can be done following conventional routes as cutting and substitution of the damage parts or double sleeve welded method. Recently, the use of composite materials for repair of damaged pipelines is increasing due to the advantages presented by this process like the ease application and the possibility of performing the repair without interrupting the use of the line. As the pipe operates under hydrostatic pressure, it is important to make a stress analysis in order to know the stresses transferred to the composite material repair. In the present work, a microstructural and mechanical characterization of two composite materials used in pipe repair is made. One of the composites is made of continuous fiber glass and the other of a fiber glass fabric, both with polymeric matrix. The first was pulltruded and the second was processed by hand lay up.