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Urethane Adhesives for Sign Fabrication

( 12/09/2021 ) Written by: Steve Webb

Wouldn’t it be nice if there was a one-size-fits-all adhesive for sign fabrication?  Such an adhesive may not exist but, thankfully, Parker LORD offers a full range of adhesives to meet every sign fabrication need. These include our very popular urethane adhesive and sealant products. 


Benefits of Urethane


Our customers have found that urethane adhesives, in particular, are great for bonding painted and primed substrates and grip well into paint and primers. These capabilities can save manufacturers significant processing time because they do not need to scuff or mask off areas for most substrates.


Urethane adhesives grip well into a multitude of composites including FRP (fiber-reinforced plastic), SMC (sheet metal compound), carbon fiber and plastics like polycarbonate, acrylic, ABS (a thermoplastic polymer), Lexan, wood and HDU (high-density urethane) foam. 

While all our urethane technologies bond primed and painted metal, plastics, wood and foam, certain products are better choices for some types of plastics or composites. In addition, surface prep may vary depending on the substrate. For example, we recommend that, for polycarbonate and acrylic, you always scuff no matter which product you use. This is due to paint and manufacturer variabilities. Scuffing enough to remove the sheen will ensure a good bond.


Choosing the Right Product


Parker LORD offers a broad selection of urethane products. They include:

  • 7550 A/C, which is the most popular adhesive for bonding trim cap. This adhesive is optically clear in color and doesn’t yellow over time when exposed to ultraviolet light.

  • 7556 A/B, translucent in color, which is designed to bond well to Lexan and when cross bonding to Lexan.

  • 7542 and 7545 which are among our top performing structural urethane adhesives. Used in applications ranging from bonding roofs and truck cabs to assembling wayfinding and street signs, 7542 and 7545 offer up to five different cure speeds and have excellent environmental properties.

  • 7610 DTM (Direct to Metal) which is our single component sealer adhesive primarily used for seam sealing. Unlike structural urethane (two-component adhesives) which do not have optimal corrosion resistance on bare metal, 7610 DTM bonds directly to bare metal without the need for priming, painting or any surface prep. 7610 DTM is also sandable and paintable. 

Ultimately, our goal is to provide a product line-up designed to meet your needs. We do not believe you should conform your processes or capabilities to fit a technology. We believe it should be the other way around. We are committed to providing you a choice in cure speed, viscosity and more, to determine the best fit for you.


Uses

  • Using urethane adhesives for wayfinding and FRP highway and road sign applications can save you both time and money. With our urethane products you can bond directly to the paint. In addition, our customers tell us they are saving significant time in the prep stage—by eliminating the need to scuff in most cases or mask off.

  • HDU foam can be very expensive. Many of our customers are saving money by buying two smaller pieces of HDU and bonding them together with 7542—routing out just what they need. 

  • For trim cap and channel letters, 7550 is the most popular adhesive because it is optically clear adhesive and doesn’t yellow.

These are just a few examples of the many applications for urethane adhesives involving paint and primed metals. To learn more, please visit our website and be sure to also watch our short webinar on Urethane Adhesives and Sealants for Sign Fabrications. 

ABOUT THE AUTHOR MORE BY THIS AUTHOR
Steve Webb

Steve Webb is an Application Engineer at LORD Corporation and is focused on current and next-generation adhesive development.
He collaborates with customers to design and implement adhesives into their manufacturing processes for optimal efficiency.

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