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Polyurethane / Urethane

Flexible 2-Part Adhesives

Structural Polyurethane (Urethane) Adhesives

The flexible tough guy of the structural adhesive world.

Polyurethane (PU) and Urethane adhesives deliver tough, rubber-like flexibility combined with strong structural bonding. They absorb vibration, flex with movement, and maintain adhesion across dissimilar materials like metal, plastic, wood, and composites.
Epoxy, MMA, and Urethane structural adhesive comparison chart

Click image to expand

2K Structural Adhesives: Your Guide to High-Performance Bonding

Choosing between Epoxy, MMA, and Urethane means balancing speed, flexibility, and environmental resistance for your project. All three provide high-strength, durable bonds that often replace welding and fasteners.

Epoxy — Strength & Resilience

  • Highest overall bond strength and heat resistance
  • Rigid, long-term bonds on metals, stone, and composites
  • Best for: concrete, metals (prepped), wood, composites

MMA — Speed & Versatility

  • Very fast fixture; minimal surface prep
  • Excellent on dissimilar, non-porous substrates
  • Best for: plastics, composites, metal fabrication

Urethane — Flexible & Impact Resistant

  • High elongation and shock absorption
  • Excellent UV and weather resistance
  • Best for: painted metals, plastics, rubbers, foams

Why Choose Polyurethane (Urethane) Adhesives

  • Flexibility & Impact Resistance — absorbs vibration, expansion, and contraction while maintaining high strength.
  • Excellent Adhesion — bonds to composites, plastics, metals, wood, and rubber with strong durability.
  • Weather & Chemical Resistance — ideal for outdoor, marine, and industrial environments.
  • Versatile Cure Options — available in one-part moisture-cure and two-part cartridge systems.
  • Dynamic Load Performance — preferred in automotive, construction, and composite panel manufacturing.

Featured Brands & Flagship Polyurethane Adhesives

Parker Lord®

LORD 7545 — structural urethane system providing excellent adhesion to FRP, SMC, and coated metals. Used widely in automotive and industrial panel bonding.

Huntsman Araldite®

Araldite 2028-1 — fast-curing, UV-stable polyurethane adhesive ideal for transparent, high-strength bonding in plastics and glass.

Permabond®

Permabond PT328 — two-part polyurethane adhesive offering balanced flexibility and strength for composites, plastics, and metals.

Ultralok®

Ultralok 905 (5 Minute Urethane) — fast-setting structural urethane adhesive with high impact resistance and minimal surface prep requirements.

ITW Plexus®

Plexus PU2105 — polyurethane-based adhesives for bonding metals, wood, and concrete with flexible, low-odor curing performance.

Need help choosing the right urethane adhesive?

Tell us your substrates, movement requirements, or environmental exposure. We’ll recommend the best flexible structural system for your project.

Flexible 2-Part Adhesives

Structural Polyurethane (Urethane) Adhesives

The flexible tough guy of the structural adhesive world.

Polyurethane (PU) and Urethane adhesives deliver tough, rubber-like flexibility combined with strong structural bonding. They absorb vibration, flex with movement, and maintain adhesion across dissimilar materials like metal, plastic, wood, and composites.
Epoxy, MMA, and Urethane structural adhesive comparison chart

Click image to expand

2K Structural Adhesives: Your Guide to High-Performance Bonding

Choosing between Epoxy, MMA, and Urethane means balancing speed, flexibility, and environmental resistance for your project. All three provide high-strength, durable bonds that often replace welding and fasteners.

Epoxy — Strength & Resilience

  • Highest overall bond strength and heat resistance
  • Rigid, long-term bonds on metals, stone, and composites
  • Best for: concrete, metals (prepped), wood, composites

MMA — Speed & Versatility

  • Very fast fixture; minimal surface prep
  • Excellent on dissimilar, non-porous substrates
  • Best for: plastics, composites, metal fabrication

Urethane — Flexible & Impact Resistant

  • High elongation and shock absorption
  • Excellent UV and weather resistance
  • Best for: painted metals, plastics, rubbers, foams

Why Choose Polyurethane (Urethane) Adhesives

  • Flexibility & Impact Resistance — absorbs vibration, expansion, and contraction while maintaining high strength.
  • Excellent Adhesion — bonds to composites, plastics, metals, wood, and rubber with strong durability.
  • Weather & Chemical Resistance — ideal for outdoor, marine, and industrial environments.
  • Versatile Cure Options — available in one-part moisture-cure and two-part cartridge systems.
  • Dynamic Load Performance — preferred in automotive, construction, and composite panel manufacturing.

Featured Brands & Flagship Polyurethane Adhesives

Parker Lord®

LORD 7545 — structural urethane system providing excellent adhesion to FRP, SMC, and coated metals. Used widely in automotive and industrial panel bonding.

Huntsman Araldite®

Araldite 2028-1 — fast-curing, UV-stable polyurethane adhesive ideal for transparent, high-strength bonding in plastics and glass.

Permabond®

Permabond PT328 — two-part polyurethane adhesive offering balanced flexibility and strength for composites, plastics, and metals.

Ultralok®

Ultralok 905 (5 Minute Urethane) — fast-setting structural urethane adhesive with high impact resistance and minimal surface prep requirements.

ITW Plexus®

Plexus PU2105 — polyurethane-based adhesives for bonding metals, wood, and concrete with flexible, low-odor curing performance.

Need help choosing the right urethane adhesive?

Tell us your substrates, movement requirements, or environmental exposure. We’ll recommend the best flexible structural system for your project.

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