As part of a BMBF-funded project, a new thermoplastic composite material has been developed at the DITF, based on cellulose-based reinforcing fibers and a thermoplastic cellulose derivative matrix. This material offers a sustainable alternative to glass- and carbon-fiber-reinforced materials and can be processed using established industrial methods such as hot pressing or pultrusion. CELLUN utilizes non-melting cellulose fibers and thermoplastic cellulose derivative fibers as a matrix. These are combined into hybrid rovings, which are then further processed. Another key focus of the project is the circularity of the CELLUN material at the end of its lifecycle (EOL). Two approaches are being pursued for this purpose: thermal reshaping without loss of quality and the physical-chemical separation of components for reuse. CELLUN materials provide an environmentally friendly and resource-efficient alternative for technical semi-finished products, particularly in lightweight construction and the automotive sector.