Expanding foam is a versatile material widely used in the construction industry for various applications. It is a type of insulation material that expands and hardens after being dispensed from a canister or container. The foam is typically composed of polyurethane or polyisocyanurate, which are polymers capable of expanding in volume when exposed to air or moisture.
When applied, expanding foam starts as a liquid but quickly expands into a foam-like substance, filling gaps, cracks, and voids. It adheres to most building materials, including wood, concrete, metal, and plastic, making it suitable for sealing and insulating various surfaces.