Valorization of Tunisian alfa fibres and sumac tannins for the elaboration of biodegradable insulating panelsHouda Saad, Bertrand Charrier, Naceur Ayed and Fatima Charrier-El-BouhtouryEur. Phys. J. Appl. Phys., 80 2 (2017) 20201DOI: https://doi.org/10.1051/epjap/2017170084