DELO has launched DELO MONOPOX HT2999, a structural adhesive with high temperature stability. According to the company, the adhesive achieves compression shear strength of 20 MPa at 180°C.

Developed primarily for use in the automotive industry and mechanical engineering, these high-temperature-resistant adhesives are reportedly in demand for use with electric motors and power electronics. According to the company, many products that are currently on the market show a clear drop in performance at temperatures above 150°C. DELO’s new structural adhesive can be used above that temperature.

This high-temperature-resistant adhesive has been optimized for bonding magnets in electric motors. The compression shear strength of bonded magnets (NdFeB) is 20 MPa at 180°C. The bonded joints remain thermally stable over time; after 10,000 hours of storage at 180°C, the bonded magnets achieve a temperature stability of 20 MPa.

The maximum operating temperature of electric motors is generally 180°C. This is because the powerful, rare earth magnets used in the motors will demagnetize at higher temperatures. If a certain application requires resistance at higher temperatures, DELO MONOPOX HT2999 can be used up to 220°C.

Electrical insulation is another important property of the adhesive. It minimizes eddy currents in electric motors, reducing heat development and increasing motor performance. Integrated spacers are provided with DELO MONOPOX HT2999. These spacers ensure a thin and uniform bonding gap of 50 µm for magnet stacking, which enables the use of more magnetic material and also contributes to motor efficiency.

The one-component epoxy resin is gray and pasty. It takes 10 min to cure in an air convection oven at 150°C. Compared to other high-temperature adhesives that require 30-40 min of curing time at 150°C, this adhesive offers clear advantages in saving time and energy.

“Four times the strength of the previous generation is a truly extraordinary step in development,” said Karl Bitzer, head of DELO’s Product Management. “And since the product is also electrically insulating, it provides additional functionalities for manufacturers of electric motors. It's a good example of how we’re pushing the boundaries of what’s technically possible, step by step.”

Learn more about DELO MONOPOX HT2999 at