PUR Hot Melt Adhesive

PUR Hot Melt Adhesive

Polyurethane reactive adhesives (PUR adhesives; also known as reactive hot melt, reactive polyurethane or RPU adhesives) are one-component formulations that combine the initial speed of a hot melt adhesive with the strength of a structural adhesive. The bonding process is divided into two stages: retention strength is achieved when the adhesive cools and cures like a hot melt; then the final structural strength is achieved by a wet curing reaction over the next 24-48 hours. These adhesives are resistant to extreme temperatures and are flexible, providing resistance to vibration and impact.


PUR hotmelt adhesives are known for their strong bonds and excellent resistance to heat, cold and humidity; this makes them ideal for most difficult-to-bond, low-energy substrates, and they also perform well in extreme weather conditions.




Features

Moisture-curing reaction

Wide material compatibility

High strength and elasticity

Weather resistance

Solvent-free

Ease of application

Fast curing

Superior bonding performance

Advantage

High bonding strength: Provides strong adhesion to a wide range of substrates, including challenging materials like plastics and metals.

Resistance to high and low temperatures: Cured adhesive remains stable in extreme conditions, suitable for temperatures ranging from -40°C to 120°C or higher.

Waterproof and moisture resistance: Offers excellent waterproofing and moisture resistance, making it ideal for humid environments or outdoor applications.

Chemical resistance: Strong resistance to oils, solvents, and cleaning agents ensures stable bonding performance.

Environmentally friendly: Low VOC emissions and solvent-free, meeting environmental standards with minimal impact on humans and the environment.

High production efficiency: Quick curing and shorter processing times make it suitable for large-scale industrial production.

Flexibility: The cured adhesive film is highly flexible, absorbing stress caused by thermal expansion or contraction to prevent bonding failure.

Durability: Exhibits excellent aging resistance, providing long-term performance without degradation.

High initial tack: Offers sufficient adhesion upon initial contact, facilitating subsequent operations.

Versatile for multiple processes: Widely used in processes such as flat lamination, wrapping, edge banding, and laminating.

Application

PUR adhesives are suitable for laminating materials such as wood and wood derivative products such as MDF, chipboard and more. Before application, the adhesives are melted with special melters, and can be applied to substrates in combination with decorative papers, veneers, CPL, thermoplastic films and HPL by use of special heated rollers or slot nozzles.

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