In which section of a vehicle would structural foam typically be injected?

Structural foam is typically injected into closed sections like pillars because these areas require reinforcement to maintain the vehicle's structural integrity. Closed sections provide a confined space that benefits from the properties of structural foam, which includes high strength and energy absorption characteristics. This treatment enhances the overall durability and safety of critical structural components, particularly in the event of an accident.

On the other hand, injecting structural foam under the hood, behind the rear bumper, or in the passenger cabin does not provide the same structural benefits as applying it to pillars, which are crucial for maintaining the vehicle's rigidity and crashworthiness. The placement within closed sections ensures that the foam can effectively bond and reinforce the surrounding materials, which is essential for improving the vehicle's collision performance.