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Considerations to Make When Choosing a Hot Melt Polyurethane Adhesive

In a recent blog, we discussed considerations to make when choosing a hot melt polyamide adhesive. These adhesives are one type within the hot melt adhesive market, which is projected to be worth $9.64 billion by 2020.

Now, let’s take a closer look at another type of hot melt adhesive: polyurethanes.

What are Hot Melt Polyurethane Adhesives?

Hot melt polyurethane adhesives are solvent-free, 100% solid adhesives. Bostik’s Supergrip product line makes hot melt polyurethanes a versatile option for the transportation and assembly markets in particular.

Hot melt polyurethane adhesives:

  • Can be one or two component systems
  • React with atmospheric moisture to form thermoset materials, which yield strong and temperature-resistant bonds.

Benefits of Bostik’s hot melt polyurethane adhesives include:

hot melt polyurethane

What Should be Considered When Choosing the Right Polyurethane Adhesive?

  1. Determine the Preferred Application Methods

Bostik’s Supergrip, hot melt polyurethane adhesives span a range of viscosities, providing flexibility in the choice of processing method:

  • Low viscosity products can be swirl sprayed.
  • High viscosity products allow for bead application.
  • All are suitable for roll coating.
  • Some products can be applied by all three methods.
  1. Recognize the Process Requirements

While the recommended application temperature for Bostik’s hot melt polyurethane adhesives is generally the same (between 110°-120°C), other process parameters can also guide the selection of the right product. These include:

  • Manufacturing lines with high throughput might require high green strength products.
  • Other processes might require an extended handling window to position parts before the adhesive is set.

Hot melt polyurethane adhesives can be designed to meet the unique requirements of each application. Additionally, Bostik’s Supergrip hot melt polyurethanes cover a range of processing considerations.

  1. Align with Performance Requirements

Substrate adhesion is a primary concern. Some of Bostik’s hot melt polyurethane products are better suited than others at adhering to low energy substrates. For example:

  • Cured polyurethane adhesives typically offer good chemical, solvent and water resistance. Bostik’s Supergrip product line offers varied levels of resistance to these conditions.
  • Polyurethane adhesives can yield rigid bonds or bonds with more elastic properties; the Supergrip line offers products on both ends of the spectrum.

For more information on hot melt polyurethanes and considerations to make when choosing the right one, call 800-7-BOSTIK.

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