The Constant pursue for quality warranty and the improvement in productivity by enterprises has inspired this work, in which a case study was carried out by an automobile shock-absorber industry. This essay aims at showing the use of Six Sigma methodology for loss reduction in one of the steps of the process, the Vulcanization, where a loss of raw material - rubber- was observed due to excess of burr in the parts caused by problems in molds, in the process and in the press. This burr excess led to rework by operators as well as to additional costs. A teamwork was formed to focus attention on loss reduction on breaking paradigm in the enterprise that it is not possible to eliminate losses within the process. Using the DMAIC tool, the problem was identified and its possible causes. Later, possibilities for improvements were analysed and action plans defined by the teamwork. At the end of the work, the timing of the operations had been improved abd reduced, generating financial gains. Besides that, the teamwork involved has been more technically developed, allowing the Six Sigma to be implemented in other areas of the enterprise.