Hot melt glues are polymer based and are 100% solids, containing no solvents or water. Hot melt glues are also thermoplastic which means they are a solid at room temperature, but liquefy upon heating. While protein glues are normally applied at 150°F, hot melts are applied at a temperature around 350°F.

The lack of water and solvents allow hot melts to attain peak bonding strength very quickly. The mechanical bonds they create means that the polymeric components in the hot melt wet out and penetrate the bonding surface prior to solidifying as they cool down again. When adhering to thermoplastic surfaces (plastics, polyolefin laminates and some coatings), bonding is similar to welding due to the high temperatures of the hot melt glue during application.






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