A sandwich core is a composite building material consisting of an inner insulation core sandwiched between two outer layers. The outer layers, often referred to as skin materials, can be a variety of materials, but polymers, metals, ceramics, and wood are among the most common. Core materials exist in many configurations, including polymers, metals, wood, and honeycomb structures. Together, the skin and core materials form lightweight composites with high strength-to-weight ratios, making them a popular choice for several industries, including the following: