Epoxy resin composition, prepreg, fiber-reinforced plastic material, and method for producing a fiber-reinforced plastic material

One embodiment includes a tetraglycidyl amine, a bisphenol type epoxy resin, a dicyandiamide, a resin composition containing an aromatic urea, tetraglycidyl amine, an EEW of 110g / eq~140g / eq the amount of total epoxy resin per 100 parts by weight in the resin composition is 30 to 60 parts by weight, the resin composition has a 160 ° C. or more Tg when cured 3 minutes at 143 ° C., 177 ° C. in a resin composition to maintain 160 ° C. Tg of greater than when cured over 1 minute.