Hot melt adhesive is a type of thermoplastic adhesive that is solid at room temperature but melts when heated. It is typically applied in a hot, liquid form and then cools and hardens to form a strong bond. Hot melt adhesives are commonly used in packaging, product assembly, and labeling applications.

One of the main advantages of hot melt adhesives is their fast set time and ability to bond to a wide range of materials, including paper, plastic, metal, and wood. They are also non-toxic and safe to use, and have a low environmental impact.

Hot melt adhesives are applied using special equipment such as hot melt glue guns, which heat the adhesive and dispense it through a nozzle. The melted adhesive is then applied to the surface of the materials to be bonded, and the bond is formed as the adhesive cools and solidifies.

Overall, hot melt adhesives offer a fast, efficient, and safe solution for many adhesive applications. They are a popular choice for industries such as packaging, printing, and consumer goods due to their ease of use and versatility.