The development of post-consumer polymers suppliers is defined as any effort made by the buyer company to its suppliers, to improve their performance or capacity, which guarantees the fulfillment of the supply in the short or long term. The main objective of the study is to improve the performance of matter that is outside impurity and density specifications through criteria of selection, intervention and evaluation of suppliers. These criteria were implemented with the following method: identification of needs for improvement of raw material by the final recycler, establishment of criteria for the evaluation of suppliers, intervention of suppliers, evaluation of results and development of a program of monitoring suppliers. At the end of the intervention, 12.5% of impurities were reduced and 400% density was increased, which caused an average increase of 8% in the raw material yield factor of the final recycler.