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PUR Hot Melt Adhesive

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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.

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Jiwei Polyurethane PUR Hot Melt Adhesive is a one-component, moisture-reactive hot melt adhesive designed for industrial bonding where fast initial handling, high final bond strength and resistance to heat and humidity are required.

The adhesive is applied in molten form. After assembly, it cools quickly to provide initial holding strength, allowing bonded parts to move to the next production step. It then continues to react with ambient moisture and develops its final cross-linked bond over approximately 24–72 hours, depending on temperature, humidity, substrate and bond-line conditions.

Available in granules, pillows and cartridges, Jiwei PUR hot melt adhesive can be used for woodworking, furniture, panel bonding, automotive interiors, packaging, textiles and other multi-material bonding applications.

Technical Characteristics

Parameter	Typical Value / Range
Base Material	Polyurethane Reactive (PUR)
Form	Granules / Pillows / Cartridges
Application Temperature	110–140°C
Open Time	2–10 minutes
Final Cure Time	24–72 hours (humidity dependent)
Temperature Resistance	-40°C to 120°C+
VOC Content	Low / Solvent-free

Features

Moisture-curing reaction for cross-linked strength

Wide material compatibility

High strength and elasticity

Weather resistance

Solvent-free

Ease of application

Fast curing

Superior bonding performance

Ease of application on automated lines

2–10 Minute Open Time for Industrial Assembly

Open time determines how long you have between applying the molten adhesive and bringing the substrates together.

Jiwei PUR hot melt adhesive can be formulated with an open time of approximately 2–10 minutes, making it suitable for production processes that require more positioning time than instant-setting conventional hot melts.

2–4 minute open time

Better suited to relatively fast assembly processes where parts are aligned and pressed soon after adhesive application.

Typical situations include:

● Small and medium components
● Short conveyor distances
● Faster assembly cycles
● Applications requiring quicker handling

5–10 minute open time

Better suited to assemblies where additional time is required for coating, positioning or joining.

Typical situations include:

● Larger bonded surfaces
● Longer transfer distances between coating and pressing
● Complex component positioning
● Slower production lines
● Multi-step assembly processes

The correct open time depends not only on the adhesive formulation, but also on coating amount, substrate temperature, ambient temperature and line speed.

Custom PUR Formulation

Different factories have different substrates, line speeds and equipment.

Jiwei can evaluate formulation adjustments for:

● Viscosity
● Open time
● Initial tack
● Application temperature
● Flow characteristics
● Specific substrate adhesion
● Final bond performance

Send us your existing adhesive specifications or production problem and our technical team can evaluate a suitable PUR formulation.

What Materials Can PUR Hot Melt Adhesive Bond?

Jiwei PUR hot melt adhesives are available for a wide range of industrial materials.

Wood & Furniture Materials

● MDF
● HDF
● Particleboard
● Plywood
● Solid wood
● Wood veneer

Decorative Films & Plastics

● PVC
● ABS
● PET
● PP
● PMMA / Acrylic
● Melamine materials
● Decorative films

Textile & Flexible Materials

● Polyester
● Nylon
● Elastic fabric
● Membrane
● Foam
● Functional textile composites

Panels & Composite Materials

● Honeycomb panels
● Decorative panels
● Door panels
● Composite boards
● Metal-faced panels

The correct adhesive should still be confirmed according to surface treatment, machine conditions and final performance requirements.

Typical Applications

This PUR hot melt adhesive is designed for industrial bonding rather than one single end-use.

Woodworking

Suitable for panel bonding, decorative components, furniture assembly and applications requiring better moisture and heat resistance than conventional thermoplastic hot melts.

Furniture Manufacturing

Can be used for furniture components, cabinets, doors, decorative panels and multi-material assembly.

Panel & Lamination Applications

Suitable for bonding decorative surfaces and composite materials where a controlled 2–10 minute working window is required.

Automotive & Transportation

PUR's combination of strength and flexibility makes it suitable for selected interior trim and multi-material assembly applications subject to vibration and temperature changes.

Textile & Flexible Materials

Selected PUR formulations can provide durable bonding while retaining flexibility for textile and flexible composite applications.

Choose the Right Open Time for Your Production Line

You do not necessarily need the longest available open time.

For faster production, a 2–4 minute formulation can reduce waiting time while still allowing component positioning.

For larger parts or more complicated assembly, a 5–10 minute formulation gives operators and equipment additional working time.

When selecting the formulation, tell Jiwei:

● Time between adhesive coating and final pressing
● Production line speed
● Component dimensions
● Substrate materials
● Application method
● Workshop temperature

We can then match the adhesive viscosity and open time to your actual production cycle.

Recommended Processing Conditions

For stable bonding, control more than just the adhesive temperature.

Adhesive Temperature

Typical application temperature is approximately 110–140°C.

Avoid overheating the adhesive for long periods because excessive heat exposure can affect viscosity and processing stability.

Substrate Temperature

Very cold materials can cause the molten PUR to cool too quickly, reducing wetting before the parts are joined.

Allow substrates to reach a suitable production temperature before bonding.

Surface Condition

Bonding surfaces should be:

● Clean
● Dry
● Free of dust
● Free of oil and release agents

Low-surface-energy plastics may require surface treatment or a specifically developed formulation.

Assembly Within Open Time

Complete positioning and pressing within the selected 2–10 minute open-time window.

If parts are joined after the adhesive has lost sufficient wetting ability, final bond performance may be reduced.

Pressure

Apply even pressure after assembly to achieve good contact between the adhesive and both substrates.

Available Forms

Jiwei PUR hot melt adhesive is available in different physical forms depending on equipment and application requirements:

Granules
Suitable for compatible industrial melting and dispensing systems.

Pillows
Convenient for industrial hot melt systems requiring controlled feeding.

Cartridges
Suitable for compatible cartridge applicators and lower-volume or precision assembly processes.

Please tell us your existing melter or dispensing equipment when requesting a product recommendation.

Storage & Handling

PUR is moisture reactive, so unopened packaging should be kept tightly sealed until use.

Recommended handling practices include:

● Store in a cool and dry environment
● Protect unopened adhesive from moisture
● Reseal partially used material whenever possible
● Avoid prolonged overheating in the melting equipment
● Remove cured adhesive from application equipment
● Use suitable PUR cleaning products for equipment maintenance

Request a Quote

Looking for a reliable PUR Hot Melt Adhesive production?

Get bulk pricing
Request technical datasheets (TDS / MSDS)
Receive customized adhesive solutions for your factory

High performance. Lower total cost. Built for industrial-scale bonding.

FAQ

How fast can bonded parts be handled?

PUR develops initial holding strength as the molten adhesive cools. This allows many assemblies to move to the next production step before complete moisture curing.

Actual handling time depends on adhesive amount, component size, substrates and production temperature.

How long does PUR take to fully cure?

Moisture curing normally continues for approximately 24–72 hours.

Temperature, humidity, substrate permeability and bond-line thickness can all affect the final curing time.

Can PUR bond plastic to metal?

Yes, suitable PUR formulations can bond combinations including plastics, metals, wood and other materials. Surface condition and plastic surface energy should be checked before production.

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