Urethane adhesives are traditionally commonly used for metal bonding. The problem with polyurethane adhesives is that they cure slowly, and it often takes a few hours or ten hours to completely cure and form a reliable bond. Using hot melt adhesive film instead of polyurethane adhesive to bond metal can improve the efficiency of metal bonding by taking advantage of the high curing speed of hot melt adhesive film.

Commonly used hot melt adhesive films for bonding metals include PO hot melt adhesive film, PES hot melt adhesive film, and PA hot melt adhesive film. These types of hot melt adhesive films have relatively strong adhesion strength to metal materials. However, there are also large differences in specific characteristics, and they need to be selected according to the specific requirements of material composites.