EP2052 fire-resistant toughened epoxy prepreg is self extinguishing and passes 12 and 60 sec vertical burn tests per FAR 25.853. It is self adhesive to aramid and aluminum honeycomb and has a cured glass-transition temperature of 239°F. The prepreg cures in as little as 20 min at 255 to 275°F. It has an out time of over three weeks.