Oscar Jara-VinuezaWilson PavonAbel RemacheFlavio ArroyoMichael GutiérrezEdgar Mora Figueroa2025-07-282025-07-282025-06-24https://doi.org/10.3390/buildings15132212<jats:p>The growing demand for sustainable materials has driven significant interest in composites reinforced with organic fibers, due to their mechanical performance, availability, and reduced environmental impact. This study investigates the mechanical behavior of two composite configurations: a cross-woven fabric and a sandwich-type panel, both made from totora (Schoenoplectus californicus) and low-density polyethylene–aluminum (LDPE–Al). Our experimental results show that the cross-woven variant achieved higher impact resistance (2.51 J), tensile strength (5.82 MPa), and greater deformation capacity (6.76%), making it more suitable for applications requiring energy absorption and flexibility, such as interior cladding and modular furniture. In contrast, the sandwich configuration exhibited superior stiffness (910 MPa), favoring structural panels and low-load roofing uses. This research distinguishes itself by integrating biodegradable totora fibers with recycled LDPE–Al to fabricate sustainable construction components, advancing circular economy principles while addressing limitations in previous composite formulations through improved mechanical balance and application-specific performance.</jats:p>Caracterización mecánicaMateriales compuestosFibras naturalesMateriales sosteniblesResistencia a la tracciónResistencia a la flexiónEconomía circularPaneles estructuralesjournal-article