This research studies some of the mechanical, thermal and physical properties for a polymer blend of polypropylene (PP) & low density polyethylene (LDPE). The blend compositions under studying were (pure PP, 25LDPE/75PP, 50LDPE/50PP, 75LDPE/25LDPE, pure PP). From the results it can be observed that the addition of LDPE to PP has been declined the tensile strength, flexural strength, flexural modulus and hardness while the density improved . the superior tensile strength was obtained at (25LDPE/75PP) composition while preferable flexural strength was ascribed to (50LDPE/50PP) blend composition.