When it comes to connecting parts by creating strong bonds with a smooth and clean surface, adhesives are the go-to option that makes for incredible results. They cut down the need for more laborious processes that consist of using nuts and bolts – elements that can be unsightly too. The ability to join a range of materials together with minimal hassle makes adhesives flexible and reliable solutions for a variety of applications.
One example of such incredible adhesives is the high-performance polyurethane glue type, derived from polyurethane polymers chosen for the durability as well as flexibility. You can find these adhesives in various forms, and they’re incredible for bonding different types of materials (including wood, metal, plastic) for both indoor and outdoor conditions. This is why they’re perfect for different uses (including automotive, industrial, construction application).
Why Use Polyurethane Glue?
Because it’s fit for professionals and hobbyists alike, and provides a range of benefits, like:
Strong Bond
If you want to get the kind of glue that can withstand whatever you put it through, be it impact, vibration, or even heavy loads, then look no further than the PU adhesive. It can handle all these with ease, as much as challenging conditions without breaking the bond since it’s the kind of adhesive that expands and fills gaps perfectly.
Altogether, this makes the adhesive durable and reliable with long-lasting performance as it’s known to successfully absorb stress and vibration. This property shows us why it’s made its way in the transport vehicles and agricultural machinery sectors.
Versatility
The incredible performance of the polyurethane glue is evident when it comes to bonding dissimilar materials such as glass, metals, wood, concrete, rubber, fabrics (like carpeting), epoxy, leather, most types of plastic and paper. Its strong bonds work well with both porous and non-porous materials alike.
This makes this glue a go-to choice for a range of projects that have to do with industrial, commercial, or even residential and personal purposes. Keep in mind it’s also relatively quick to set (quicker than some epoxies) as 24 to 48 hours is enough for most depending on the conditions. It’s an aspect that further adds to its “all-purpose adhesive” essence as it can cure even in the most challenging environments like heat or moisture depending on the type of glue you get.
Resistant Properties
The polyurethane adhesives are an option known for the durable and strong properties. In depth, this is due to the resistance to water to some degree (some formulations more than others), as well as the resistance to temperature fluctuations; it can be applied at a wide range of operating temperatures too, making it a great option when the temperatures are between -40°C and 100°C. What’s more, the bond is highly durable and resistant to ageing, UV exposure, and even chemical degradation once properly cured.
Finish Possibilities
Don’t like the thought of having the adhesive apparent, differing from the hue of the materials you’re using it to bond? Not to worry, unlike other glues or adhesives, the polyurethane ones give you the flexibility with customisation once the curing process is complete. You can sand, paint or stain them as you choose, which is a benefit that’s especially useful for woodworking or furniture repairs resulting in an aesthetic boost.
Eco-Friendliness
When you compare the polyurethane adhesive option to formaldehyde, its eco-friendliness becomes apparent. It’s a choice that’s low in the harmful VOCs (some options even have zero VOCs), and it happens to be solvent-free. It’s also possible to find food-safe formulations.
What Are the Disadvantages of Using Polyurethane Glue?
We’ve talked about all the benefits that make polyurethane an incredible adhesive choice, but it’s also necessary to mention a few of its drawbacks so you know what to expect. First of all, it’s a more expensive option than other glue types, mainly due to the aforementioned benefits like versatility, resistance, durability, and longer lifespan. Remember to consider this as it affects the budget if you have to get a bigger amount for a bigger project; costs can pile up.
Also, while resistant to moisture to some degree, polyurethane isn’t entirely resistant to it and excess moisture can lead to crystallisation or expansion, either in the container or during the application, both of which could affect the bond strength. There’s another side-effect to this – the drawback could affect your project’s result and efficiency overall.
Working with the glue can also be somewhat difficult at first, as without proper clamping you won’t be able to control the expansion – this is a drawback that could negatively impact the finish since you won’t get a clean result. To make sure you know what you’re doing, it’s advisable to practise a little and do some testing before applying on the materials you intend to bond. For minimal hassle and cleanup, be sure to wear gloves and cover the surface you’re working on.
