On one side, there are the rivets, bolts, and welds. These are methods that clearly demonstrate their functionality, mechanical technologies we understand extremely well and have been using for a very long time. You don’t need anyone to explain how to tighten a bolt or how this mechanism manages to hold two pieces of metal firmly together. In fact, we’re accustomed to seeing ships, skyscrapers, and even bridges held together by massive bolts, assuming that metals are joined through welding. For these reasons, we naturally gravitate toward these "mechanical fastening" solutions, which are familiar, "simple." And yet, knowing that in countless industrial sectors, for various needs, rivets, bolts, and welds have often been replaced by structural adhesives, it’s surprising. These adhesives have become the go-to solution for bonding metals, plastics, and many other materials due to their numerous advantages, such as greater lightness, instant bonding, no need for pre-drilling, clean aesthetics, and more. All of these points could also apply to high-performance tapes, not just structural adhesives. Still, doubt persists: do structural adhesives really work? Are they truly strong enough to replace rivets, bolts, and welds in industrial settings? Let's explore.
In short, structural adhesives explained: We’ve already covered what structural adhesives are, so here we’ll be brief: in essence, they are incredibly strong adhesives. Qualitatively speaking, a structural adhesive can be described as a glue that creates a bond at least as strong as the materials it joins. However, when it comes to strength, performance, and safety, qualitative definitions fall short. In the U.S., adhesives with a shear strength exceeding 7 megapascals are considered structural, whereas in Europe, the bar is set even higher; only adhesives with a shear strength above 10 megapascals qualify as structural.
The typical structural adhesive is liquid and thermosetting, but it’s worth noting that there are several variants. It’s also important to emphasize that these aren’t new products on the market. On the contrary, they are highly refined products. Consider that 3M launched its first contact adhesive based on neoprene in 1942 and introduced the first flexible structural epoxy adhesive and even the first liquid spray adhesive in the 1960s. Structural adhesives are a well-established and standardized reality; let’s see how effective they really are.
Structural adhesives do work: results of tests
To understand how and how well structural adhesives perform, there’s nothing better or more useful than comparing them with the classic fastening solutions they often replace.
The most important metric for expressing the power of a fastening solution is the aforementioned shear strength of overlap: which method—whether flow welding, spot welding, rivets, bolts, or structural adhesives—yields the greatest resistance? Well, at the bottom of the list, with the worst results, are the famous rivets. While they are relatively inexpensive and fairly quick to use, they don’t stand out for design flexibility or aesthetic appeal. Bolts follow, which, like rivets, can certainly ensure high resistance where they are installed but cannot contribute to the rest of the surface area. Spot welding performs slightly better, but it remains a fastening method that works only at distinct points. The two methods that provide the highest overlap shear strength are flow welding and structural adhesives, both of which can perform up to three times better than the "weak" rivets.
For every use case
With numbers in hand, structural adhesives work, and often better than traditional fastening solutions. They can be used in a variety of situations: for bonding metals, plastics, and composites, for stable and flexible surfaces, to withstand extreme temperatures, and so on. We invite you to explore the best structural adhesives available on our e-commerce platform to find the one that best suits your industrial processes!
In conclusion, structural adhesives are not just a niche product; they are a reliable and versatile solution that can revolutionize how industries approach bonding. Whether you're in automotive manufacturing, aerospace engineering, or construction, structural adhesives offer benefits that traditional methods simply cannot match. So why not take the next step and discover how these adhesives can enhance your projects?
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