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Hot melt polyurethane reactive (HMPUR) solutions have been popular adhesives of choice for decades, from high-volume manufacturing to D.I.Y. home repair. Featuring advantages in strength, durability, and set time over traditional variants, HMPUR products can be developed with different properties for specific applications. But with an array of options available in the market today, what are the factors to be considered in making the right choice?
Leading global multi-market adhesive specialist Bostik (www.bostik.com) shares its expertise on HMPUR solutions. The company has developed a line of innovative HMPUR products under the Bostik Born2Bond™ brand, which are widely used in electronic devices manufacturing, a key sector in the electronics industry that accounts for up to 50% of the total value of exports of most Asian countries, according to investasean.asean.org. Here, Bostik presents some important guidelines in choosing the perfect HMPUR product.
The process of selecting the right HMPUR solution starts with determining the preferred application method. As these adhesives are flexible to different applications, the viscosity level needs to be factored. The swirl spray method works better with low-viscosity products, as bead applications are more suitable for variants with high viscosity. Meanwhile, roll coating proves suitable for both. Bostik’s HMPUR solutions come in a range of viscosities that cover all methods, with some products that can even be used by all three applications.
Another point to consider is process requirements. While the recommended application temperature for Bostik's HMPUR solutions is typically between 110°C - 130°C, other process parameters can also guide the selection of the right product. Manufacturing lines with high throughput might require high initial-strength products. Meanwhile, other processes might need an extended handling window to position parts before the adhesive is set. Bostik covers a variety of processing considerations to cater to different demands for HMPUR solutions.
Lastly, alignment with performance specifications. Start by marking substrate adhesion as a primary concern. Cured polyurethane adhesives typically offer good chemical, solvent, and water resistance. Bostik’s HMPUR product line offers varying levels of resistance to these conditions.
Bostik’s HMPUR solutions are part of the Bostik Born2Bond™ brand, a portfolio of ground-breaking engineering adhesives that focus on 'by-the-dot’ bonding applications. For more information about BostikBorn2Bond™ HMPUR solutions, visit https://www.bostik.com/.