 The present study evaluates the effectiveness of local vegetable fibers, specifically LIF date palm tree fiber extracted from Biscara, Algeria, as a new composite biomaterial by determining its mechanical characteristics, including elastic modulus and Poisson's coefficient, and comparing it with other synthetic and plant fibers previously studied. This article was authored by Youssef Jeblon, Mabrouk Hessony, Tarek Dudi and others.