Designed for applications up to 425ºF. Three 4-ply skins of 10-ounce fiberglass cloth (.030 thickness) with two Honeycomb cores in a sandwich structure. A total of 12 plies of fiberglass and epoxy. Honeycomb tooling panel post cured and fabricated with fiberglass and epoxy with aluminum core perforated and corrosion resistant. Staged post cured to 425ºF.