The automotive industry has witnessed a massive shift in terms of materials used, ranging from being a metallic heavyweight in the 1950s to employing a hybrid sandwich of multiple material systems. This apparent shift can be attributed to achieving improvements in performance, safety and fuel efficiency, along with responding to the various environmental regulations imposed by different governments. The recent advocacy of Corporate Average Fuel Economy (CAFE) standard of 54.5 MPG by 2025 by the US Environmental Protection Agency (EPA) to reduce greenhouse gas (GHG) emissions  has spurred the sector at large towards the use of lightweight materials.
Pradeep, Sai Aditya; Shukla, Srishti; Brown, Nathaniel; and Pilla, Srikanth, "Thermoplastics Foams: An Automotive Perspective" (2023). Publications. 104.