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We are five students who are performing an LCA on different packaging materials. We don't hade access to ex.ecoinvent but are wondering if anyone can help us with finding valid data on different packaging materials (glas, rubber, wellpapp and more) or giving us information of databases with valid data?

Hi, well I would look for products in Nexus (https://nexus.openlca.org/search); you can deselect databases you do not want / have, or select only free data sets. The question of validity is of course more tricky, and hard to answer if you do not specify more what you need (e.g., which country).
Hth, Andreas