Adhesives like glue are a part of everyday life. This is why it’s more convenient for people to stock up on glue for the whole year without constantly having to run out for more. But if you can’t utilize all the glue products in time and you see dust sitting over them, you might wonder if your glue is still good or not.
So, if you’re someone who has a ton of glue sitting for a long time and you’re doubtful of its shelf-life, you’ve come to the right place. Our discussion comprises answers to questions like ‘does glue expire?’ and all the aspects regarding the shelf-life of glue to help you out.
Shelf-Life of Glue
Since we’re talking about the expiration of glues, let’s start by going through the basics first. Like any other adhesive, glue also has the characteristics of expiring over a fixed period.
Although there are certain ways in which you can slow this down, the expiration process is inevitable.
1. Why Is There No Expiration Date on the Glue Sometimes?
Usually, some glue manufacturing companies tend to avoid providing a certain date of expiration on glues. But glues that are generally marketed for household purposes usually bear an expiration date lasting for an average of 2-3 years.
This period is known as the shelf-life of glue. Even if you can’t find any evidence of expiration, it is recommended to use up your glue within this timespan and discard it if it has surpassed said period.
Of course, you can find some high-quality companies that are now starting to display the entire expiration date on their bottles. This also varies on the basis of storage environments.
You can increase the efficacy and longevity of glue by storing it under specific conditions. Besides, the amount of glue contained inside as well as the size of the glue containing bottle will also affect the expiration of the glue.
On the other hand, many companies publish a manufacturing or packaging date that will help you to determine an approximate expiry date based on assumptions regarding the average shelf-life.
2. The Expiration Date Depends on Material
Most glues differ in their expiration dates based on the material. For example, PVA glues usually have a shelf life of 2-3 years in a sealed state which can convert to around 1 year when they’re opened. So, if you have PVA glues stocked up, it’s wiser to use them within this timespan.
Polyurethane glues tend to last for 2 years in a sealed state and a year when they’re opened. In this way, knowing the type of glue can help you calculate an estimated time within which you need to use your glues up fast. Otherwise, there’s a fair chance that they’re going to be pretty useless.
So, you can easily tell by now that glues can expire in a few years of time, but the process can be slowed down or expedited through certain factors.
How to Tell If the Glue Has Expired
Now that you’ve had an idea regarding the expiration date of most glue products, let’s discuss how you can determine whether your glue has expired.
You can check if your glue is still good by analyzing its features and characteristics. This includes the consistency, color, and appearance of the glue in the bottle. Whether the glue has gone bad or not depends solely upon examining how it feels on touch and how it looks in terms of impression.
The easiest way to tell if your glue has gone bad is by simply testing out some of the glue between your two fingers. You can say that your glue has expired if there’s no sticky feeling, and you don’t feel any clinging strands on your fingers.
Besides, you can keep rubbing the glue between your fingers for some time till you feel the stickiness. In some glues which are close to being bad, the stickiness might take a few seconds to arrive.
But if you don’t find the tacky feeling even after some time, then it’s pretty clear that the glue is pretty useless now.
In other cases, your glue might turn moldy and hard and that’s when you know that it’s time to part ways. Mold will grow in glue as long there is some sort of moisture trapped in the bottles.
So, if you’ve been noticing hard, clumpy, and cakey glue, then there’s a high chance that your glue was not stored properly.
Another characteristic to notice is the color change. If the glue remains clear or close to its transparent color, then it’s good. But when there are colors like orange, yellow, or amber, then you can definitely say that the glue has gone bad. This is the easiest and earliest symptom that you can notice to confirm the expiration of the glue.
Therefore, you can tell easily how your glue has gone bad by observing the nature, consistency, and color.
Use of Glue After Expiry
Just like any other product, using an adhesive or specifically a glue after it has surpassed its expiration can be a matter of concern to anyone.
To be honest, expired products have their own cons and the case is the same with glue. Glue that has expired will turn hard and form lumps instead of maintaining a viscid consistency. This kind of glue is basically useless.
If you try to attach two surfaces of different objects with an expired glue, the lack of stickiness will eventually prevent any union from forming.
Using an expired glue might also lead to a change in the color and texture of a surface. This is because an expired glue tends to contain certain synthetic polymer substances in its composition, which can undergo change over time.
When the glue is expired, these substances lose their efficacy and result in a change of appearance and consistency. As a result, using the glue can be of no use and can also be harmful to the surfaces you’re using it on.
How to Increase the Longevity of Glue
When we say that the shelf-life of glue varies between 2-3 years, we’re just stating the facts. However, there are some ways in which you can actually extend your glue’s shelf-life easily.
This extension of shelf-life differs from glue to glue. One variety might not attain the same longevity as the other one. It happens because of differences in characteristics.
For example, if we talk about our good old PVA glue, you can increase its shelf-life by storing it in a cool storage space. In fact, you can increase the longevity of any wood glue by storing them in cool environments. This can be your basement, refrigerator, etc.
Exposure to air tends to reduce the shelf-life of glue or any adhesive. Air exposure tends to build up moisture inside glue bottles easily, lowering the liquid’s longevity.
To prevent this kind of situation, it is always a good idea to keep your glue bottle closed airtight. This way, you can not only prevent the entry of excess moisture but also help to maintain the actual consistency of the adhesive.
Overall, in these specific ways, you can increase the shelf-life of your glue, so that even after they have expired, you can continue to use them in an efficient way.
To wrap things up, it can be said that if the questions like ‘does glue expire?’, ‘how can I use expired glue?’, etc. have crossed your mind, our discussion will be good for you.
Through our study, you can learn about the different ways that affect the shelf-life of glue and the processes of stretching this time span. Of course, glue plays a vital role in everyday life, and learning about its expiration and preservation can be quite helpful in the long run.