Other than the size and physical properties of the parts produced, here are a few of the notable differences between structural foam and conventional injection molding: Lighter Parts; Stronger more impact-resistant parts; Better strength to weight ratio; Less molded-in part stress; Thicker walls; Wall thicknesses can vary; Taller features such as bosses and ribs can be used; Acoustic sound dampening properties; Design flexibility; Low-pressure allows the use of aluminum molds; Less demand on tools resulting in longer life compared to high-pressure tools