It is often difficult to figure out which glue is best for different materials. In most cases, we all keep that one-purpose- serves-all glue handy for a quick fix around the home. However, it is more challenging to handle certain materials than others. Materials like rubber do not always go well with all kinds of glue. To compound the problem, rubber comes in different types and forms. Therefore, figuring out the best glue for rubber is often a difficult task.
Due to the rate of abuse of rubber, the best glue for rubber should be flexible and resistant to impact just like plastic. Having this in mind will make it easier for us to select the best glues for rubber.
It is necessary that we also introduce you to the different types of rubbers available today. The term rubber encompasses a variety of synthetic materials with superior flexibility, that are resistant to impact and coefficient of friction. Therefore, before you can go ahead to say this is the best glue for rubber it is wise to first understand the available different types.
Below, we will provide you with a list of the available types of rubber and their application.
Note that, whether the plastic you want to glue is a natural or nitrile rubber. It is essential to get rid of any trace of grease from the surface before gluing. You can do this by the use of a solvent to clean the surface. Priming (with sand) or buffing the glue surface can also be helpful.
At the end of this article, you will figure out what glue is best for plastic, and when you need them.
Today, rubber accounts for a large percentage of household wares and other appliances we use in everyday life. Due to how popular and common rubber is today, people rarely care about the differences. Many people wrongly assume that all rubbers are the same with the same properties and quality. However, there are different types of rubber available today with unique properties and characteristics.
Rubber is one of the materials that are notably difficult to glue together. This is the reason most people choose to discard and replace instead of trying to repair rubber items.
Rubber glue comes in many different types with unique properties and requires physical, thermal, electrical, and chemical properties. The glue you use for each type of rubber must also satisfy the properties of the rubber you want to glue. Therefore, there are different things you need to put into consideration when selecting glue for rubber.
Consider the type of rubber
There are different types of rubber available in the market today. Some of these rubbers are very common while others are scarce to find. The most common types of rubber in the market today are nitrile, butyl, natural rubber, silicone, and EPDM rubber. There are numerous others you can come across. However, these are more common and make up a vast majority of what we see around today. They can be found in inner tubes, gloves, gaskets, hoses, boots, etc.
Understanding the type of rubber you are working with is the best step to selecting the right glue for it. While some glue will work best for the natural robber, others are best for other kinds of rubber.
One of the ways you can identify the type of rubber is by using the product’s recycle logo. The recycle logo is something that a lot of us already know. Whenever you see three arrows in form of a triangle, that is what we refer to as the recycle logo. When you look closely, this logo always contains a number or a code that tells one type of plastic apart from the other. The primary aim of this is to ensure the proper recycling of plastic. Generally, there are a total of eight recycling codes for rubber, which gives you a clue to the exact type of rubber.
However, these codes are essential to telling you about the kind of rubber you are dealing with and provides a clue to the best type of glue to use. Once you figure out the kind of plastic you have, picking the right glue is easier. Rubber is usually labelled in categories 1,2,3,4 and 5. Items in category one are often the most difficult if not impossible to glue. Other plastics carry the numbers 6 and 7 respectively, which are rare to come by.
When choosing the best glue for rubber, it is essential to also consider the curing time of the glue. Many people make the mistake of failing to read the direction of use before using glue. While some may take a shorter time to cure, others will take up to two days to properly cure.
To enjoy the maximum benefit: Ensure you understand the direction of use before using the glue. If the direction states that you need to cure for 48 hours, it is vital to follow the direction.
While many people overlook this point, it is very essential if you want your glue to bond well using glue under the wrong weather conditions can affect the performance of the glue, same as the wrong use.
Some glue is water-resistant and can work well under wet conditions. However, there are also a good number of glue that is not water-resistant, and using them in wet conditions can affect their performance.
No matter the rubber type you are working with, taking the time to prepare the plastic is essential for good bonding.
Begin by using a solvent to remove all forms of additives like grease, mould, and other types of lubricants. The use of isopropanol can help get rid of all kinds of slip additives from the plastic.
You can also use acetone for the same purpose. However, it is not advisable to do so since acetone may be too powerful for certain types of rubber.
Are you still wondering what kind of glue is best for your rubber? We generally recommend that you select glue following the type of plastic that you want to glue.
In general, we often recommend the use of a cyanoacrylate instant adhesive for your rubber. Cyanoacrylate glues are k own by the generic name super glue and cure very fast. The importance of this is that you will know instantly is your glue works fine for the plastic or not.
Apply a thin strip of glue on the surfaces that you want to glue together and squeeze both surfaces together. If after six seconds bonding does not occur, know that you may be dealing with the more difficult types of rubber which are the natural rubber or the silicone rubber.
When you are working with natural rubber or silicone, it is essential to use the appropriate glue to avoid running into problems.
For natural rubber or EPDM, you should consider using special cyanoacrylate glue like the Loctite AA324 Speebonder Acrylic Glue or the ASI series that are both specially formulated for bonding natural rubber. If you are working with silicone, we already stressed the use of a primer before now. Using a primer on the bonding surface will help prepare the surface for bonding.
Bonding Rubber to other rubber can be tough. However, the main problem arises when you need to bond rubber to other substrates. When trying to bond plastic to other materials like wood, glass, bricks, metal, etc. You have to consider the properties of both materials and also the goal you wish to achieve at the end of the day.
When working with multiple surfaces, it is best to work with epoxy glues. Naturally, epoxy glue may not work well for bonding rubber to rubber, but it does an effective job for bonding rubber to another surface.
Most materials bond better if the adhesive is made from similar materials. Therefore, to bond two pieces of silicone, silicone-based glue is the best option. Using silicone glue for silicone means that the silicone does not lose its flexibility, clear colour, and is heat-resistance. The use of silicone glue ensures that the silicone retains its waterproof nature after sealing.
The RTV 4500 silicon-based adhesive from ‘Silco’ is convenient to use for silicone rubber. If you are looking for the best glue for silicone rubber, RTV 4500 is your first option. The RTV 4500 is self-curing and easy to apply.
One of the reasons why we are recommending this glue it’s because it is high-resistance nature. It is resistant to high-heat temperature, weathering, moisture, ozone, and vibration. The RTV 4500 also meets the NSF requirement for approval as food-grade silicone glue.
Note that, for best bonding, priming the surface of the silicone is essential. Silicone rubber has a low coefficient of friction. Priming provides the roughness the glue needs to bond.
In case you find yourself still a little bit confused about the kind of rubber you want to glue, the Clear Gorilla Superglue gel can be handy. The glue is general-purpose glue that can work well for all plastics except natural plastic.
We carefully chose this super glue because it is convenient to use and cures very fast. It cures within 45 seconds of your application. Due to the gel formula, this product is also suitable for use on vertical surfaces.
While it looks similar to your old school super glue, the Gorilla super glue comes with an anti-clog cap. The cap ensures that the glue does not dry off after use. It also contains unique rubber particles that enhance strength and impact resistance.
The clear Gorilla super glue is clear in colour. When you use the glue, it will not change the colours of your plastic.
Bonding two hard rubbers like Nitrile can be difficult without the right glue. You need glue with the same matching strength and impact-resistance. For this kind of plastic, you need a tough Epoxy, two-component waterproof glue like Devcon 5.
Epoxy glues are very tough and excellent for all kinds of bonding. Devcon 5 is excellent for its quick-setting features. It is ideal for quick and instantly fixing: like a valve seat.
As the name implies, Devcon 5 only takes 5 minutes to completely cure. Therefore, once you mix the substance, you have only two minutes to finish the application.
Devcon 5 is suitable for Nitrile and other hard rubber. Using it for other flexible rubbers like silicone or butyl may not work out well. Once the epoxy hardens, it becomes very rigid and may fall off if you stretch or bend the glued joint frequently.
When it comes to bonding natural rubber, acrylic glue is your best choice. The acrylic glue costs a little more than the other glues. When it comes to working with rubber, natural rubber is one of the most difficult to work with.
The Loctite AA324 Speebonder works effectively with an activator, which the manufacturer sells separately. The work of the activator is to help accelerate the curing time of the glue. Without the activator, Loctite AA324 can take as much as 48 hours to cure.
Acrylic glues are excellent for their longer shelf-stability, durability against damage by external influences, and toughness. To increase the toughness of the joints after bonding, heat curing is necessary. However, it is essential to follow the proper directive when curing with heat.
Acrylic bonds are essential when you want to create an industrial-grade quality joint. They provide the best result for natural rubber and other difficult rubbers.
Long shelf stability
Cures with fire for increased toughness
Good for industrial-grade joint
The Shoe Goo glue is designed specially to bind shoes together. The Shoe Goo is a contact adhesive and sealant that is effective for sealing bethyl rubber and work boots, high impact boots, and high impact boots. The Shoe Goo glue can serve as an excellent sealant for boots. It is also effective for sealing safety gloves.
The Shoe Goo glue comes in two colours, black and clear, which makes it ideal for shoe repair. Working with Shoe Goo glue ensures that the glue does not interfere with the colours of your shoe. It works effectively even for heavy-duty shoes.
Shoe Goo glue is best for fixing worn-out soles and broken heels. It is also a good way to protect shoes from damage from elements. The formula is highly resistant and designed for stronger bonding to flexible rubber.
Pacer tech future gel superglue is more than just a rubber glue. It is one glue that comes in handy for a variety of items. The glue works well for most of the rubber types and other types of soft and hard surfaces. It has a very fast curing time which makes it ideal when you are in a hurry.
Pacer tech future gel superglue is also temperature resistance and weather resistance. Therefore, you can use it to work both outdoor and works fine for both porous and no-porous materials. It is the best choice when you want to quickly fix something.
Pacer tech future gel super glue also works well on dirty and greasy surfaces. Allow curing for 24 hours for the best experience.
Slime 1050 Rubber Cement glue is best known for flat tire prevention. Slime rubber cement is easy to use and works well for all kinds of rubber repair. It offers everything you need when it comes to the complete repair of rubber.
Slime 1050 Rubber Cement glue comes with a plastic handle that you can use to store the glue by hanging. Therefore, you no longer have to worry about children reaching the glue.
Slime 1050 Rubber Cement glue is very versatile and can come in handy for different gluing purposes. It is very tough and bonds strongly, making it ideal for even items you use frequently. When it fully cures, you can paint on it.
Slime 1050 Rubber Cement glue does not interfere with your original colors. Once it is fully cured, it is non-flammable.
There are important guidelines, which are essential if you’re working with rubber and glue that will help ensure you get the perfect bond. Adhering to these guidelines will help ensure the glue maintains its strength and the bond remains durable.
When working with glue and rubber, it is essential to know the exact type of rubber you are working with and select the right glue. Rubber comes in many types, and when you know the exact type you are dealing with, it is easier to know the type of glue to buy. Using the wrong glue can damage your rubber – or in some cases, the rubber will not bond.
Taking the time to follow the proper preparation steps is essential to get the perfect bonding when working with rubber. Properly cleaning the bonding surface is crucial to achieving success when gluing rubber.
Again, ensure you understand the correct clamping time when using glue on rubber. The correct clamping time is how long you need to hold the rubber together to allow a perfect bond. Disturbing the rubber too early will weaken the strength of the glue and affect the final results.
After bonding, don’t be too eager to use the item. Ensure that your bond properly cures before using the item.
There are situations whereby the glued surface undergoes a lot of stress. Such parts like generator starter handles may be difficult to fix with glue. In such cases, it is best to replace the parts.