Abstract: A lightweight multilayer substrate comprising a thermally compressed nonwoven core having a first surface and an opposed second surface, at least one top layer adhered to the first surface of the thermally compressed nonwoven core, and, optionally, at least one bottom layer adhered to the opposed second surface of the thermally compressed nonwoven core. The lightweight multilayer substrate has a specific modulus greater than 1200 (MPa/(g/cm3)) and a thermal expansion coefficient of less than 3×10?5 m/(m*° C.). The lightweight multilayer substrate is thermally balanced between 25° C. and 70° C.