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For the home user, adhesives that can withstand temperatures of up to 158 degrees Fahrenheit (70 degrees Celsius) are usually perfectly adequate. However, there are also applications that require higher temperature resistance and thus a heat-resistant adhesive. In this article, we reveal which adhesives are heat-resistant and what you can repair with a temperature-resistant adhesive.
Table of Contents
What Are Heat-Resistant Adhesives?
Conventional adhesives are used in areas that do not place high demands on temperature resistance, be it in the repair of household items, art, or industry. Sometimes, however, substrates need to be bonded that demand more from the adhesive.
This is the case, for example, when you need to bond the glass of an oven. Temperature-resistant adhesives are also frequently used on automobiles, especially in the interior. Although temperatures there are not extreme, they can easily reach 140 degrees Fahrenheit (60 degrees Celsius) or more in summer. But that is not all: Repairs to the engine and exhaust system require a temperature resistance of several hundred degrees. For such and similar purposes, a high-quality heat-resistant adhesive should be used. You can easily find out whether an adhesive is heat-resistant from the package insert. However, make sure that the heat resistance is really specified, otherwise there is a risk of unpleasant surprises.
Temperature-resistant adhesives should be able to bond many different materials. It must also be possible to combine different materials. There is little advantage to the user if a metal adhesive is heat-resistant but unable to join metallic materials with others. Therefore, the adhesive should at least be suitable for the following materials:
- Some plastics
- Stone and concrete
- Mineral materials
The curing time of the adhesive can vary considerably. Both fast-curing adhesives and slow-curing adhesives are available.
Areas of Application for Temperature-Resistant Adhesives
Temperature-resistant adhesives differ in one essential feature: While some of them are “only” able to withstand extreme heat, others can also compensate for high temperature fluctuations. The bonds formed by all heat-resistant adhesives are extremely stable, even under high loads. For this reason, such adhesives are extremely popular, especially in industrial environments. Temperature-resistant adhesives are popular for the following applications:
- For use on stoves as well as ovens
- In electric and combustion engines
- As sealants and joints in many industrial plants
- On ovens and fireplaces
- For screwed joints
- As joints in exhaust and heating systems
In addition, adhesives are also a much-used sealant. They can be used to reliably and durably seal many components in industrial plants and machines. However, the adhesive used must also be designated as a sealant.
What to Consider When Buying Heat-Resistant Glue
What exactly are the characteristics that make a good temperature-resistant adhesive? To help you choose the right adhesive, we have drawn up the following list of things to consider:
- The adhesive should form a bond that is durable and stable, even when exposed to heat.
- The adhesive seam should be able to withstand the demands placed on it in terms of hardness, vibration, elasticity, and so on.
- The adhesive should be viscous enough to be applied easily while meeting the requirements.
- The curing time should be adequate.
- The adhesive must be suitable for the materials to be bonded.
- Other environmental influences such as wetness and moisture must also be taken into account.
- Furthermore, the appearance plays a role: Is the adhesive inconspicuous or does the adhesive seam affect the appearance of the substrates?
If you choose the right adhesive for your needs, you can even use it as a substitute for screwing, soldering, or welding. The adhesive seam is just as stressable as a welded seam and the connection just as strong.
If you are unsure whether the adhesive in question is suitable for your purposes, you can study the data sheet supplied or, if necessary, seek advice from the manufacturer or the store. The question of whether the adhesive is suitable for the material to be bonded is often linked to the issue of heat resistance.
As a rule, an adhesive for plastic, for example, does not have to be able to withstand high temperatures, as the material can also be damaged by heat. A good metal adhesive, on the other hand, should be heat-resistant. Metal in particular is a material that is often exposed to high temperatures.
Where conventional adhesives can lose much of their adhesive strength at temperatures above 212 degrees Fahrenheit (100 degrees Celsius), a high-quality heat-resistant adhesive can withstand much higher temperatures. But which one is best suited for durable and temperature-resistant bonding?
Heat-Resistant Adhesive for Fireplaces and Stoves: DAP High-Heat Mortar Fire Stop Caulk
This high-temperature glue is perfect for your fireplace, stove, or chimney areas due to its non-combustible properties and ability to withstand temperatures of up to 2000 degrees Fahrehnheit (1093 degrees Celsius). Once fired, this adhesive becomes extremely tough and as hard as a rock. It can be used to stop air leaks, for patching, and for sealing areas around your fireplaces and wood-burning stoves. This product is easy to apply and saves energy.
This heat-resistant adhesive by DAP is ideal for fixing up your fireplace, chimney, or your stove. Although on the cheaper side, this product offers excellent value for money.
Heat-Resistant Adhesive for Metals: J-B WELD ExtremeHeat Temperature-Resistant Metallic Paste
The J-B Weld brand was developed as an alterntive to welding with a torch, and this high-temp adhesive has been formulated for repairs on iron, steel, and metal surfaces in temperatures as high as 1000 degrees Fahrenheit (538 degrees Celsius). This simple-to-use product, once cured, provides an extremely strong and permanent bond. The cured glue can then be drilled, sanded, or machined. This product is non-flammable, water-based, solvent-free, and contains no VOCs.
- Formulated for high-temperature repairs on iron, steel, and metal
- No solvents or volatile organic compounds (VOCs)
- Once set, creates a permanent bong stronger than steel
- Simple to use
- Forms a permanent bond stronger than steel
- Solvent- and VOC-free
- Requires a long curing time
- Can be prone to cracks
J-B Weld’s temperature-resistant adhesive for metal is offered at a great price considering the high quality of the product. With far more advantages than disadvantages, you will get great value when using this adhesive.
Heat-Resistant Silicone Adhesive: RUTLAND High-Heat Silicone
Rutland’s heatproof silicone adhesive will cover all of your sealant and adhesive requirements, as it will form a tough, flexible seal in addition to strong adherence. This product will adhere to most kinds of surfaces, provided that they are clean. With a heat capacity of up to 500 degrees Fahrenheit (260 degrees Celsius), this powerful adhesive will work to bond and seal any number of items, and can even be used to seal away gases and smoke. This adhesive is ideal for high-humidity areas, and is available in various colors and sizes.
Nevertheless, due to the overwhelming advantages, we can speak out in favor of the heat-resistant silicone adhesive from Rutland with a clear conscience.
Temperature-Resistant Adhesive for Plastic: HENKEL CORPORATION Loctite Stik ‘n Seal Extreme Conditions Adhesive
This high-temperature adhesive boasts that it bonds to surfaces more quickly than most other adhesives. Henkel Corporation’s high-temp glue can be used on both outdoor and indoor surfaces, and can even bond two wet surfaces together. The application process emits very little odor, and the cured glue will not crack, peel, or shrink. This is a great product for filling in gaps on uneven surfaces, and will offer great resistance to the effects of weather, impact, moisture, temperature, UV light, and more.
- Bonds surfaces faster than ordinary household adhesives
- Final bond withstands all conditions both indoors and out
- Bond is inert and safe once fully dry
- Bonds and adheres quickly
- Can be used indoors and outdoors
- Works on wet surfaces
- Low odor
- Will not peel, crack, or shrink
- Highly resistant to extreme weather conditions
- Applicator tip not very precise
- Poor quality tube material
We also recommend this adhesive, as its positive features were convincing. There is also nothing to criticize about the price.
Instructions and Notes for the Processing of a Heat-Resistant Adhesive
Processing a heat-resistant adhesive is simple. First of all, you should read the package insert, as it already contains instructions for processing. Depending on the adhesive, the instructions may vary. This applies in particular to the processing and curing time, but also to the application on one or both sides.
You should also pay attention to the processing temperature of the adhesive, as most adhesives can only be optimally processed by the user within a certain temperature range. This factor should not be underestimated, because if the temperature falls below or exceeds this range, the adhesive properties can be impaired.
To bond the two substrates together as desired, you must first clean them. In most cases, you can use acetone or isopropanol for this purpose in order to remove grease and oil residues as well as other impurities. Incidentally, this also includes finger grease, so you should only touch the cleaned surfaces with gloves. In addition, there should be no dust or other dirt on the substrates.
Many surfaces should also be roughened before the bonding process. This applies to metallic substrates in particular. Note that these must be cleaned before and after the sanding process, otherwise contaminants could be introduced into the material from the sanding process. In this way, the adhesive properties of the glue can be impaired.
Now, follow the manufacturer’s instructions regarding the application of the adhesive on one or both sides. Join the substrates together and fix them if necessary. Pay attention to the contact pressure – some adhesives may only be joined with little pressure, while others require much higher forces.
As far as the curing time is concerned, this depends, among other things, on the air humidity and the ambient temperature. For this, study the manufacturer’s data sheet. Once the adhesive has fully cured, the bonded seam can often be painted or mechanically processed. In the case of a glued joint that is to be exposed to high temperatures, you must of course pay attention to the temperature resistance of the paint used.
Frequently Asked Questions
Is Superglue Heat-Resistant?
The question as to whether superglue is heat-resistant can quickly be answered with a clear no. It can withstand relatively high ambient temperatures, but it should not be exposed to temperatures above 212 degrees Fahrenheit (100 degrees Celsius). Above 356 degrees Fahrenheit (180 degrees Celsius), the bond achieved with superglue can even easily be dissolved again.
Is Mounting Adhesive Heat-Resistant?
Assembly adhesive is not heat-resistant. Its temperature resistance is in a range between -40 and 176 degrees Fahrenheit (-40 and 80 degrees Celsius).
How Heat-Resistant Is Hot Glue?
The hot-melt adhesive (HMA), which is bar shaped at ambient temperature, is heated to around 392 degrees Fahrenheit (200 degrees Celsius) inside the hot-melt gun and melts. In this state, it is easy to apply and forms extremely stable bonds. However, the adhesive seam is relatively sensitive, and it will come loose again if the heat is too high, so caution is advised.
For some applications, you need a heat-resistant adhesive. We hope that we have been able to help you choose the right adhesive for your project and have answered your questions.