PMDA (Pyromellitic dianhydride)/31 A "B" stage of 17 min at 180'F or 8 min at 260'F was required. The shelf life of the pre-preg was 1-3 days at 73'F or 4 weeks at 40'F. A press cure of 30 min at 380'F and 30 psi was followed by a post cure of 24 hr at 450'F. No. "Araldite" 6020 (210 epoxide equiv.)/100 PMDA/20 Phthalic Anhydride/28 Laminates "Epon" 828 (185-192 epoxide equiv.)/75 Dicyclopentadiene dioxide/50 PMDA/40 Bakelite ERL 2774 (185-200 epoxide equiv.)/100 Methyl Ethyl Ketone/75 "Epon" 828 (185-192 epoxide equiv.)/100 Epon 828/64.6 PMDA/56 Diethanolamine/7.8 Glass "Microballoon" Spheres/27.6 Tetrahydrofurfuryl alcohol (containing 1% dicyandiamide)/20