Permabond 825 is a heat-resistant adhesive unique in the world of cyanoacrylates.

When looking for a heat-resistant adhesive, most people would opt for an epoxy, a silicone or even a polyurethane adhesive. These adhesive chemistries either tend to withstand heat well naturally, or can be easily formulated to do so.

A cyanoacrylate, on the other hand, would probably not be most people’s first choice for a heat-resistant adhesive. As a rule, they tend to lose performance quickly at raised temperatures. They weaken at around 80°C (176°F) and after 100°C (212°F) often fail completely. Some cyanoacrylates can withstand higher temperatures but require a post-cure to do so. This is a two-step curing process where the adhesive is first cured at room temperature for a specified time. Then, it is heat cured for a specified time at a certain temperature.

Permabond 825, on the other hand, is a cyanoacrylate designed to withstand temperatures as high as 200°C (392°F). Containing patented technology, this adhesive not only withstands high temperatures but does so without a secondary cure! This combination of factors means you can now get all the benefits of a cyanoacrylate – fast setting, ease of use, and excellent adhesion on a wide variety of substrates –  alongside effortless high heat resistance.

The lack of a secondary heat cure saves customers time and money. It makes Permabond 825 ideal for high-speed production lines where speed and ease of dispensing are paramount.

Excellent resistance to thermal aging

In addition to its heat resistance, Permabond 825 also excels when subjected to thermal aging – a gradual change in a material’s physical or chemical properties due to long-term exposure to elevated temperatures.

When an adhesive is repeatedly heated or held at a high temperature, its internal structure can slowly degrade. This leads to loss of performance, such as reduced strength, increased brittleness, and discoloration. Permabond 825, however, retains excellent strength when exposed to high temperatures for long periods. It maintains close to 80% of its full strength after 1,000 hours at 180°C (356°F). This further showcases this product’s outstanding heat resistant properties.

Key features and benefits of Permabond 825:

• High temperature resistance (up to 200°C/392°F)
• No secondary heat/post-cure required
• High strength after thermal aging
• Thermal stability with gap up to 0.15mm
• Low viscosity
• Rapid curing
• 100% reactive – no solvents
• Ease of use – no mixing

Heat-resistant adhesives are often highly sought after in the automotive and aerospace industries, among others. Permabond 825 is highly suitable for use in these industries due to its rapid curing speed and lack of secondary cure. It bonds well to a variety of metals, such as aluminium & stainless steel. It also works well on plastics like polycarbonate, low- and high-density polyethylene and PVC, as well as certain rubbers. All this combines to make 825 a highly versatile product. It should be high on your list when you next need a heat-resistant adhesive!

If you’d like to find out more about this product or to discuss your application with us, please get in touch.