LORD Corporation

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Acrylic Automotive Assembly Adhesives

The viscosity of acrylic adhesives allow for very easy dispensing by hand while maintaining a non-sag characteristic. Also, acrylic adhesives change color during cure, giving a visual indication that the adhesives is cured. Another key property of acrylic adhesives is that they can have a long room temperature open time but once they begin to react, they quickly reach handling strength. Other adhesive chemistries are not able to match this cure profile.

  • Two components or "parts":
    • Acrylic (A-Side)
    • Accelerator (B-Side)
  • Uncured properties:
    • Odor
    • Creamy, paste-like consistency
  • Application properties:
    • Insensitive to small variations in mix ratio
    • Acrylic adhesives can be used with a variety of accelerators (curatives)
      • This can affect mix ratio, viscosity, color change and application method
    • Have a range of open times from several minutes to about an hour
    • Cure rapidly to handling strength and full cure at room temperature
    • Cure can be accelerated with moderate heat (<140°F, 70°C)
  • Cured properties:
    • Excellent adhesion to unprepared or minimally prepared metals, composites, and most thermoplastics
    • Excellent impact, shear, and peel strengths
    • Moderate elongation (~40%)
    • Withstands temperatures up to ~300°F (150°C) depending on product
    • Surface cure is inhibited by oxygen in air – results in a thin layer of surface tack on exposed areas
    • Does not bond well to porous surfaces (O2 inhibition)
  • Key advantages:
    • Designed to bond to a wide range of metals and composites with little to no surface preparation
      • Will bond through light surface oils and similar rust preventatives
      • No scuffing, sanding, or primers typically required to achieve adhesion to bare metals
      • This offers process efficiencies and cost savings
    • Maintains strength and adhesion after long term exposure to multiple environments, such as salt fog, humidity, thermal cycling, and various chemical exposures
    • Ability to withstand post-processing and e-coat temperature exposures up to 400°F
      • Offers the ability to utilize the higher structural strength of bonding to the pre-painted surface as opposed to bonding to the paint layer or masking/sanding the paint layer to expose bare metal surface after coating
    • Glass bead technology enables the ability to create optimum bond line thicknesses

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