Presentation by Klaudia Śliwa-Wieczorek et al. on "Hardwood-based composites with flexible polyurethane adhesive joints". Presented during the 2025 Joint Convention of the Forest Products Society and the Society of Wood Science & Technology "Wood for a Sustainable Future: Strengthening the Connection Between Industry and Science" which took place in Fort Collins, June 15-20, 2025, Colorado, USA. Presentation contains main findings of the research undertaken within the "DIAgnostics and Mechanical tests Of aged adhesive layers used in joiNts of wooDen structureS" (DIAMONDS) project which was funded in whole or in part by the National Science Centre, Poland under the OPUS call in the Weave programme, project No. 2021/43/I/ST8/00554