Adhesive Heat-resistant adhesive / High-temperature adhesive
Adhesives with high heat resistance
The term "high-temperature adhesive" does not have a single fixed definition. In some contexts, you can read that high-temperature adhesives include all adhesives with a heat resistance of 200 °C or more. In other contexts, the definition depends on the specific heat resistance of a given adhesive.
Most super glues (cyanoacrylates) have a heat resistance between 80 °C and 140 °C. However, there are a few cases where super glue is specially manufactured to have a heat resistance of around 200 °C. According to the first definition, such an adhesive would be classified as a high-temperature adhesive.
In many cases, an adhesive’s heat resistance plays a role in finding the right product for a given task.
If the materials will be exposed to more than 125 °C, you can already rule out almost all polyurethane adhesives and MS polymer adhesives.
Methyl methacrylate adhesives, anaerobic adhesives, and UV/light-curing adhesives often have a heat resistance of up to 180 °C, and some epoxy adhesives can withstand up to 220 °C.
In industry, however, there is sometimes a need for adhesives that can withstand even higher temperatures. This is where silicone adhesives have a significant advantage. Some silicone adhesives have a heat resistance of up to 388 °C.
It is important to note that the mentioned temperatures are indicative. Different adhesives of the same type do not necessarily have the same heat resistance—in fact, the range can be quite broad.
Some 2-component epoxy adhesives have a heat resistance of 60 °C, while others can withstand 180 °C. Some silicone adhesives can withstand 150 °C, while others can reach 388 °C.
Therefore, pay attention to the specific temperature requirements the adhesive must meet. Also, note that even if an adhesive has a certain heat resistance, it does not mean that its strength will remain unaffected until that temperature is reached.
A 2-component epoxy adhesive with a heat resistance of 100 °C will lose some of its strength before reaching 100 °C (see figure).
Ceramic adhesive
Ceramic adhesive is a special type with extremely high heat resistance. Even within this type, there are large variations, but most ceramic adhesives have a heat resistance of at least 1,000 °C. These adhesives have a very high viscosity—almost like a thick paste.
They usually adhere well to glass, metal, ceramics, and fiberglass.
They are the optimal choice for gaskets and similar applications in ovens, fireplaces, and wood stoves. Many ceramic adhesives cure at room temperature, but curing can often be accelerated with mild heating.
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