Below is a list of Polyurethane Adhesive manufacturers from Valencia, California. Polyurethane adhesive is a flexible, high strength bonding material made from a reaction of isocyanine compound with an active hydrogen compound. The result is a clear, glue-like substance that forms a tough yet flexible bond between two surfaces. Even after it has cured, polyurethane adhesive will not break or crack if the objects it is holding together bend.