Patent ID: 8178606

Claim:
A composite structure comprising a conductive surfacing film formed on a prepreg layup, wherein said surfacing film comprises silver flakes distributed substantially uniformly throughout the film in a substantially interconnected, lamellar configuration, and is formed from a curable thermosetting composition comprising: a. at least one multifunctional epoxy resin; b. at least one curing agent selected from the group consisting of: aromatic primary amines, bisureas, boron trifluoride complexes, and dicyandiamide; c. at least one toughening agent having a functional group selected from epoxy groups, carboxylic acid groups, amino groups and hydroxyl groups capable of reacting with other components of the composition; d. non-conductive fillers; e. silver flakes in an amount greater than about 35 wt. %, based on the total weight of the composition, said surfacing film has an electrical resistivity of less than 500 mΩ/sq and a film weight in the range of 0.01-0.15 psf (pounds per square foot), and said prepreg layup is comprised of a plurality of prepreg layers, each of said prepreg layers being formed from a sheet of fibers impregnated with a matrix material.