There exists few tools to help the designer to advise or choose a material, to obtain precise information about its impacts on the environment. The question is to know how the existing tools can answer the questions of the designers, if they satisfy their expectancies and if they are useful to help him to have a broader view of the environmental impacts of the product that is designed. Two types of eco-materials library were identified: the tangible material's libraries and the databases Initially, these various tools and the specific information that they provide on the environmental aspects will be defined. Within this framework, a description of 3 French Materials Library and 2 data bases will introduce a comparison of the data collected on 2 types of materials, the Polypropylene and Aluminum. The results of this work will be presented within a workshop with designers.