The objective of the work is to establish a methodology for testing formulations for pressure sensitive adhesives, to find out which ones give higher value for peel adhesion, while keeping good performance for all other properties. Formulations were prepared in laboratory, based on a statistical Design of Experiments, varying the amount of two different types of plasticizer and one type of resin. The choice of those three components was made based on experience. Contour line diagrams, created by the statistical software Design Expert, were used in order to analyse which formulations give better results. Finally, samples with the best outcomes were reproduced and their results compared with the forecast of the statistical model. The methodology proved to be adequate, leading to the manufacture of new optimized samples.