New structural adhesive offers class-leading temperature stability

DELO has launched an adhesive with high-temperature stability. DELO MONOPOX HT2999 delivers strengths of 20MPa at 180C. This is four times greater than its predecessor. The product was produced principally for the automotive industry and mechanical engineering.

Its performance profile has been optimised for bonding magnets in electric motors. For example, the compression shear strength of bonded magnets (NdFeB) is 20MPa at 180C, with the bonded joints remaining thermally stable in the long term. Even after 1,0000 hours of storage at 180C, they offer temperature stability of 20MPa. The maximum operating temperature of electric motors is commonly 180C since the powerful rare earth magnets will demagnetise at higher temperatures. If a certain application needs resistance at higher temperatures, the adhesive can even be used up to 220C.

The one-component epoxy resin is grey and pasty. It takes only ten minutes to cure in an air convection oven at 150C. Compared to other high-temperature adhesives that need 30 to 40 minutes of curing time at 150C, this adhesive provides clear advantages in time savings and energy.

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