Permabond introduces high-temperature magnet adhesive

Electric vehicles (EVs) make extensive use of electric motors, with a constant push from this market for smaller, more lightweight and efficient motors. Smaller, lighter motors tend to get a lot hotter than their larger counterparts, as they have far less ability to dissipate the very high heat produced by these vehicles.

Motor manufacturers are therefore facing ever-increasing demand for higher and higher temperature resistance, and motors with Class H insulation are in particular highly sought after by EV manufacturers - these can withstand temperatures up to 180degC and are ideally suited for use in these vehicles.

It was to meet just this industry demand that Permabond developed its new high temperature magnet adhesive. Permabond ES5516 is a heat-curing single-part epoxy adhesive that offers outstanding hot strength performance, maintaining high-strength structural bonds at 180degC. This makes it ideally suited to the bonding of class H electric motor magnets, including those in permanent magnet synchronous motors. Other uses include fixing any small close-fitting parts where there is no ability to mechanically clamp.

A key feature of this adhesive is its dual activation. Once the adhesive has been applied, the bond can first be sealed or 'tacked' with UV light, before being subsequently heat cured. This 'tack strength' helps to prevent adhesive outflows from bonded joints before curing. It's also of great help in applications where accurate alignment of parts is required, as parts can be tacked in place before entering the heat-curing process.