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  3. Bonding and Assembly
  4. Structural Adhesives
  5. PUR Adhesives
Bonding and Assembly
Hero image of the 3M Trifecta and the PUR adhesive chemical breakdown using our structural Adhesive benefits

PUR Adhesives

Three features to love: one-part application, rapid handling strength and high final strength.

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Structural strength with hot melt speed

  • Polyurethane reactive adhesives (PUR adhesives; also called reactive hot melts, reactive polyurethanes or RPU adhesives) are one-part formulations that combine the initial speed of a hot melt adhesive with the strength of a structural adhesive. The bond forms in two stages: when the adhesive cools back down and solidifies like a hot melt it reaches holding strength, then the moisture-curing reaction proceeds over the next 24-48 hours to reach final structural strength. These adhesives are resistant to temperature extremes and flexible to provide vibration and impact resistance.

    3M™ Scotch-Weld™ PUR Adhesives have a range of open times that can be adjusted to suit your process, and they have low to no Volatile Organic Compounds (VOCs). These adhesives bond well to metals, glass, ceramics, wood and some plastics such as polystyrene and polyacrylic. The combination of no-mix one-part application, rapid handling strength and high final strength makes PUR adhesives excellent candidates to help improve throughput and reduce processing time.

Featured PUR Adhesive products

3M PUR structural adhesives offer a range of open times and low to no VOCs. Specific formulations pair well with metals, glass, ceramics, wood and some plastics. Explore the options to find the best fit for your product and process.

  • Discover the important attributes of PUR Adhesives

    Hotspot selector of PUR Epoxy attributes
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Strength

After cooling, PUR adhesives use ambient moisture to continue curing for hours to days while increasing in strength

Bonding

PUR adhesives are excellent for bonding materials such as wood or plastic to themselves or to glass or metal

Process Efficiency

Applied as a hot melt, PUR adhesives rapidly cool down to handling strength so they can be moved to the next station

Impact Resistance

Depending on the chemistry, structural adhesive bonds provide the strength or flexibility to resist shock, vibration and impact loads

Lightweighting

Adhering to new materials and distributing stress along the entire bond area helps designers use thinner and lighter materials

NVH

Stiff bonds resist vibration and reduce opportunities for loose parts to make unwanted noise

Aesthetics

Structural adhesives provide better product appearance through invisible joints and smooth bond lines

Water Intrusion

Structural adhesives provide a continuous bond line to prevent the migration of fluids, dust and dirt

Innovation in Design

The ability of structural adhesives to bond a wide variety of substrates allows the freedom to design for the best materials available

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Frequently asked questions

Different customers often bring up similar questions when they work with our adhesive experts. Here are some of the most common ones.

Visit FAQs

See 3M™ Scotch-Weld™ Structural PUR Adhesives in action

  • Video still of two different tubes of 3M™ Scotch-Weld™ PUR Adhesive with the caption “Open times range from 1-10 minutes”
    PUR Adhesive Introduction Video (2:05)
    See how 3M™ Scotch-Weld™ PUR Adhesives combine the speed of hot melt adhesives with the strength of structural adhesives to deliver fast, strong, secure bonds in a one-part formulation.
  • Video still of the engineer with the caption “Caution: Ensure one of your substrates is water permeable (no metal-to-metal)
    Dos and Don’ts of PUR Adhesive Dispensing (1:44)
    A 3M Senior Application Engineer provides tips for dispensing 3M™ Scotch-Weld™ PUR Adhesives along with when and why they’re a good solution.
  • Video still showing application to wood with the caption “Larger bead will have longer open time”
    3M™ Scotch-Weld™ PUR Adhesive Demonstration (3:39)
    A 3M Senior Application Engineer demonstrates bonding with 3M™ Scotch-Weld™ PUR Adhesives in wood-to-wood, glass-to-plastic, plastic-to-metal and wood-to-metal applications.
We're here to help.

Need help finding the right product for your project? Contact us if you need product, technical or application advice or want to collaborate with a 3M technical specialist, or give us a call at 1-800-831-0658.

Need help finding the right product for your project? Contact us if you need product, technical or application advice or want to collaborate with a 3M technical specialist, or give us a call at 1-800-831-0658.

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