Polyurethane (PUR) Adhesives
Upgrade to a Polyurethane Reactive Hot Melt Adhesive
Polyurethane reactive (PUR) hot melt adhesives are moisture-curing adhesives that combine the fast bonding of a hot melt with the great strength of a reactive polyurethane. Like traditional hot melts, PUR hot melt adhesives cool and harden to create the initial bond, but they continue to cure and increase in strength as they react with moisture in the air and on the substrate.
PUR hot melt adhesives are great for applications that require additional bond strength and durability. Aside from stronger bond strength, hot melt polyurethane adhesives can also offer more controlled and longer open times than traditional hot melts.
We have a collection of PUR adhesives with a range of open times and available in sizes from 50-gram cartridges to totes. Polyurethane adhesives also require specialty equipment like PUR glue guns. If you have questions or want assistance finding the right PUR adhesive solution for your application, contact one of our adhesive experts.
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Common Questions About Polyurethane (PUR) Adhesives
Traditional hot melt adhesives are thermoplastic and cool to form a bond. On the other hand, PUR hot melt adhesives continue curing through a chemical reaction with moisture in the air and on the substrate. Consequently, polyurethane hot melt glues create stronger and more durable bonds with improved heat and chemical resistance.
PUR adhesives can bond a wide range of materials, including:
- Wood
- MDF and particleboard
- Plastics
- Metal
- Glass
- Fabric and textiles
- Foam
- Composites
- Laminates
- Leather
The best adhesive depends on the specific materials and application requirements.
Polyurethane adhesives can reach handling strength within seconds or minutes as they cool, but the full moisture cure generally takes anywhere from 24 to 72 hours. Cure time depends on the specific adhesive formulation, bond line thickness, humidity, and temperature.
Because of their moisture sensitivity, these adhesives require specialty, PUR-compatible equipment like PUR glue guns and PUR hot melt tanks. This equipment typically also needs specialized maintenance procedures or cleaners.
Yes. PUR hot melt adhesives are widely used in woodworking because of their high bond strength and moisture resistance. They are commonly used in applications like edge banding, profile wrapping, cabinet assembly, furniture manufacturing, and laminating.
Once fully cured, PUR hot melt adhesives provide excellent water resistance and can perform well in high-humidity and intermittent wet environments. The level of water resistance depends on the specific adhesive formulation.
