Hot Melt Glues
While L.D. Davis does not manufacture hot melt glues we are a distributor for one of the largest global industrial glues manufacturers, H.B. Fuller. We have been partners of H.B. Fuller for over a decade. In 2013 L.D. Davis won H.B. Fuller’s “Diamond Award” distributor of the year for outstanding growth.
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.
Download our hot melt troubleshooting guide.
Hot Melt Applications
Hot melts are used in a wide variety of industries, such as construction and electronics industries. Metals, plastics and paper are a few of the materials to which hot melts work excellent with and provide great adhesion. They have also been used in some book binding processes, but it is very uncommon whereas others use natural, eco-friendly glues such as our animal glue.
Hot melt glues are manufactured in pellets, pillows and glue sticks form. The proper form depends on the application, size of operation and the function of the hot melt glue in product production. The first picture shows hot melt in pellet form and the second picture shows pillow form.
Physical Properties of Hot Melt Glues
- Polymer-the component of hot melts that determines its strengths, toughness and flexibility
- Wax- waxes are selected for controlling the open time and set speed of the hot melt
- Antioxidant-they are added to improve the pot life (prevent charring and other oxidation reactions)
- Plasticizers and/or diluents are sometimes also added to improve the flow characteristics and modify the viscosity and open time of the hot melt
- Aggressive bonds
- Reduced char
- Low/no odor
- No stringing/ Tailing
- Increased Mileage-Reduced viscosity gain
- Light in color
- Clean machining