Polyurethane adhesive is a versatile bonding agent made from a polymer that contains urethane links. It is known for its strong adhesion to various materials, including wood, metal, plastic, and ceramics. This type of adhesive is often used in construction, automotive, and furniture industries due to its durability and resistance to moisture and temperature changes. One of the key features of polyurethane adhesive is its flexibility, allowing it to absorb stress and movement without breaking. It typically comes in two forms: one-part and two-part systems. The one-part version cures with moisture in the air, while the two-part version requires mixing before application for optimal performance.