Understanding the melting temperature of hot glue is essential for manufacturers, DIY users, packaging professionals, and product engineers who rely on consistent bonding performance. Hot melt adhesive is designed to soften, flow, and bond once it reaches a specific temperature range, and different formulations behave differently depending on their polymer base and additives. Knowing these temperature thresholds helps ensure stronger adhesion, safer operation, and improved production efficiency.
Most general-purpose hot glue sticks melt between 120°C and 180°C. This wide range reflects variations in material composition, viscosity control, and intended application. Once heated, the adhesive becomes fully molten, allowing it to wet surfaces and create a mechanical bond as it cools. Below this temperature range, the glue remains solid and cannot achieve optimal flow or bonding strength.
The melting behavior of hot glue can be influenced by factors such as stick diameter, polymer purity, and the power output of the glue gun. Industrial-grade hot melt adhesives often require higher operating temperatures to guarantee stability during high-speed packaging, woodworking, electronic assembly, or automotive component production.
| Type of Hot Glue | Approximate Melting Temperature | Notes |
|---|---|---|
| EVA Hot Melt | 160°C–180°C | Widely used for packaging and crafts |
| Polyamide Hot Melt | 130°C–160°C | Higher chemical resistance |
| Polyolefin Hot Melt | 120°C–140°C | Used for electronics and sensitive materials |
| Pressure-Sensitive Hot Melt | 100°C–130°C | Lower melting point for label and tape applications |
The melting point of hot glue is not fixed across all adhesive types. Several characteristics affect how the adhesive softens and liquefies during operation.
Each polymer type has its own thermal transition zone. EVA typically melts at higher temperatures due to its vinyl acetate content, while polyolefin structures soften at lower temperatures and maintain flexibility after cooling.
Tackifiers, waxes, and stabilizers can increase or reduce the melting point. Higher wax content often lowers the temperature required for softening but may reduce heat resistance after curing.
Industrial bonding environments may require adhesives with elevated melting temperatures to avoid premature softening. Packaging lines, for example, rely on adhesives that maintain integrity during heat exposure.
Glue guns, tank melters, and extrusion systems operate at controlled temperatures. Inadequate heat prevents full melting, while excessive heat may degrade the adhesive.
The melting temperature refers to when the adhesive begins to soften. However, the working temperature is typically slightly higher to ensure full fluidity for proper bonding. Most hot glue guns operate at:
Low-temperature systems: 120°C–150°C
High-temperature systems: 170°C–200°C
At these temperatures, the adhesive viscosity decreases, allowing smooth spreading on porous and non-porous substrates. After application, cooling typically happens within seconds, creating a rapid and dependable bond.
When selecting a hot melt adhesive, it is important to match its melting and working temperature with the substrate and operating conditions. EVA is suitable for high-strength packaging. Polyamide is preferred for heat-resistant automotive parts. Polyolefin options benefit electronics due to their lower melting temperature and reduced thermal stress on components.
Low-temperature hot melt is often chosen for heat-sensitive materials such as foam, fabric, plastic films, or coated papers where higher temperatures could cause deformation.
Proper temperature control ensures adhesive strength, reduces waste, and prevents charring or discoloration.
Allow the glue gun or melter to preheat fully before use.
Maintain steady operating temperature to avoid inconsistent viscosity.
Test the adhesive flow if working in cold environments, as lower ambient temperatures cause faster heat loss.
Use the correct glue stick diameter to maintain stable melting performance.
For industrial systems, monitor tank temperatures to prevent thermal degradation.
For users seeking stable melting performance, clean formulation, and consistent bonding strength, HUACHUN offers a comprehensive range of hot melt adhesives suitable for packaging, woodworking, textiles, filters, and electronics. Their products are engineered for predictable melting behavior, smooth flow characteristics, and strong performance across diverse substrates, making them a reliable choice for businesses seeking high-quality adhesive solutions.
Hot glue typically melts at temperatures between 120°C and 180°C, with the exact point depending on polymer composition and application requirements. Understanding this temperature range ensures safer operation, improved efficiency, and stronger bonding in both manufacturing and daily-use environments. By selecting high-quality adhesives and maintaining proper temperature control, users can achieve consistent and long-lasting results.
