Gli adesivi strutturali funzionano davvero?

On one side, there are rivets, bolts, and welds—methods that clearly show how they work. These are mechanical fastening technologies we understand very well and have used for a long time. There's no need for anyone to explain how to tighten a bolt or how this mechanism holds two metal pieces together. In fact, we're used to seeing ships, buildings, and even bridges held together by massive bolts, and we take for granted that metals are joined through welding. Because of all these reasons, we naturally tend toward these mechanical fastening solutions, which are known and "simple." Yet, despite this, we know that in many industrial sectors, for various needs, these rivets, bolts, and welds have often been replaced by structural adhesives. These glues have become the default solution for bonding metals, plastics, and other materials due to their many advantages, such as increased lightness, instant bonding, no pre-drilling required, clean aesthetics, and more. All of these points could also be made about high-performance tapes, not just structural adhesives. Still, the question often remains: do structural adhesives really work? Are they strong enough to replace rivets, bolts, and welds in your company? Let’s find out.

A Quick Overview of Structural Adhesives

We've already touched on what structural adhesives are, so here we'll be brief. In short, they can simply be described as extremely strong glues. If we want to give a qualitative definition, we can say that a structural adhesive is a glue that creates a bond at least as strong as the materials it's joining. But when it comes to strength, performance, and safety, qualitative descriptions can fall short. That's why, in the United States, adhesives with a shear strength of over 7 megapascals are considered structural. In Europe, the standard is even higher: an adhesive is only classified as structural if its shear strength exceeds 10 megapascals.

The typical structural adhesive is a liquid, thermosetting type, but there are several variations. It's also worth noting that these aren't new products. In fact, they're well-established. For example, 3M launched the first neoprene-based contact adhesive in 1942, and in the 1960s introduced the first flexible structural epoxy adhesive, as well as the first liquid spray adhesive. So, structural adhesives are a proven, well-regulated technology. Let's now see just how effective they really are.

Do Structural Adhesives Really Work? The Test Results

To understand how and how well structural adhesives work, nothing is better than comparing them with traditional fastening methods that they are sometimes meant to replace.

The most important data point when measuring the strength of a fastening solution is the already-mentioned shear strength. Which method—spot welding, flow welding, rivets, bolts, or structural adhesives—provides the highest strength? Well, at the bottom of the list, with the worst results, are the familiar rivets. They are cheap, quick to use, but don’t excel in design flexibility or aesthetics. Then come the bolts, which, like rivets, can certainly provide high strength at the point where they’re installed, but cannot work across the rest of the surface. Slightly better is spot welding, but it still only works at specific points. The two methods that offer the highest shear strength are flow welding and structural adhesives, often performing up to three times better than rivets.

For Every Application

Numbers aside, structural adhesives work, often better than traditional fastening methods. They can be used in many different situations: for bonding metals, plastics, and composites; for both rigid and flexible surfaces; for resisting extreme temperatures, and more. We invite you to explore the best structural adhesives available in our online store to find the one that suits your business needs perfectly!

Reflex Gauge Glass

Reflex Gauge Glass

Reflex Level Gauge glass is made from borosilicate glass and aluminosilicate glass. There are grooves on the side of the glass surface facing the medium. Generally, the number of grooves is 3 or 4.

It is used in industrial boiler level gauges to display and read the level. The groove makes the reading clearer. Called Sight Glass and reflex sight glass, reflex glass will be finely ground, polished and toughened during processing to make it strong and transparent, and resist the erosion of the liquid in the boiler. The production process is strictly in accordance with the DIN7081 standard.

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