This dissertation exposes the characterisation of a nanocomposite made of epoxy resin with carbon nanotubes. The project involves the production of the materials and the fabrication of the specimens to be tested thermally and mechanically. The aim of this work is to show the thermal and mechanical improvement achieved in the epoxy resin by the incorporation of a small amount of carbon nanotubes. The experiment will show special interest in the study of the thermal characteristics of the nanocomposite. There have been insufficient studies about thermal properties on carbon nanotube-epoxy materials with low percentage of carbon nanotube reinforcement. Therefore, the data gathered in this study will help to improve the knowledge of the thermal behaviour of this type of materials. The initial stage of the project is focused in the development of the methodology to be followed during the characterisation. This part will be also destined to carry out a research on nanocomposites, carbon nanotubes and epoxy resins. The methodology developed for the characterization was based on the guidelines given by the American Society for Testing and Materials (ASTM) Standards for composite materials. The second part of the project covers the fabrication of the specimens and its thermal and mechanical characterisation. The results obtained will be exposed using graphic aids and tables. Finally, the last part of the report will be destined to the analysis of the data collected during the tests, and the production of conclusions. The results obtained from the thermal characterisation, performed using DSC and thermo gravimetric analysis, showed modifications in the thermal properties of the epoxy resin. Light changes in the temperature of the glass transition and the activation energy were detected. The mechanical characterisation performed using tensile, flexion and impact test, showed an increment in tensile and flexural strength due to the addition of CNs in the epoxy resin. The great interest from the industry in developing new polymer materials with improved properties, enhance the relevance of the topic presented.