TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The amount of the component (b) is 5-55 wt.%, relative to the weight ratio of the mixture. The component (a2) is triethylenetetramine, 1,3-bis(aminomethyl)cyclohexane, isophoronediamine or N-aminoethylpiperazine (all preferred), 1,12-diaminododecane, 1,10-diaminodecane, 1,2-diaminocyclohexane, 1,2-propanediamine, 1,3-propanediamine, 1-methyl-2,4-diaminocyclohexane, 2,2'-oxybis(ethylamine), 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, 4,4'-methylenedianiline, 4-ethyl-4-methylamino-1-octylamine, diethylenetriamine, ethylenediamine, hexamethylenediamine, menthane diamine, xylylenediamine, neopentanediamine, norbornanediamine, octanemethylenediamine, piperazine, 4,8-diamino-tricyclo(5.2.1.0)decane, tolylenediamine or trimethylhexamethylenediamine. The amount of (I) is 5-55 wt.%, relative to the mixture. The component (b) is tetramethylguanidine. The ratio of (a1) to (a2) is 0.1-10 to 1.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The blend further comprises fibrous reinforcing materials. Preferred Components: The component (a) is an amine with a functionality of greater than or equal to 2. The component (a) comprises at least two hardener components (a1) and (a2), where (a1) is at least one polyether amine with a functionality of greater than or equal to 2 and (a2) is a further amine with a functionality of greater than or equal to 2. The component (a1) is 3,6-dioxa-1,8-octane diamine, 4,7,10-trioxa-1,13-tridecane diamine, 4,7-dioxa-1,10-decane diamine, 4,9-dioxa-1,12-docecane diamine, polyether amine on the basis of triethylene glycol with an average molecular weight of 148, difunctional, primary polyether amine produced by amination of a propylene oxide with grafted-ethylene glycol with an average molecular weight of 176, difunctional, primary polyether amine on the basis of propylene oxide with an average molecular weight of 4000, difunctional, primary polyether amine produced by the amination of polyethylene glycols with an average molecular weight of 2003 grafted with propylene oxide, aliphatic polyether amine on the basis of polyethylene glycols with an average molecular weight of 900 grafted with propylene oxide, aliphatic polyether amine on the basis of polyethylene glycols with an average molecular weight of 600 grafted with propylene oxide, difunctional, primary polyether amine produced by the amination of diethylene glycols with an average molecular weight of 220 grafted with propylene oxide, aliphatic polyether amine on the basis of copolymers from poly(tetramethylene ether glycol) and polypropylene glycol with an average molecular weight of 1000, aliphatic polyether amine on the basis of copolymers from poly(tetramethylene etherglycol) and polypropylene glycol with an average molecular weight of 1900, aliphatic polyether amine on the basis of copolymers from poly(tetramethylene etherglycol) and polypropylene glycol with an average molecular weight of 1400, polyether triamine on the basis of at least one trivalent alcohol with an average molecular weight of 400 grafted with butylene oxide, aliphatic polyether amine produced by the amination of alcohols with an average molecular weight of 219 grafted with butylene oxide, polyether amine on the basis of pentaerythritol and propylene oxide with an average molecular weight of 600, difunctional, primary polyether amine on the basis of polypropylene glycol with an average molecular weight of 2000, difunctional, primary polyether amine on the basis of the polypropylene glycol with an average molecular weight of 230, difunctional, primary polyether amine on the basis of polypropylene glycol with an average molecular weight of 400, trifunctional, primary polyether amine produced by the reaction of propylene oxide with trimethylolpropane followed by the amination of the terminal hydroxyl groups with an average molecular weight of 403, trifunctional, primary polyether amine produced by the reaction of propylene oxide with glycerin followed by the amination of the terminal hydroxyl groups with an average molecular weight of 5000, or a polyether amine with an average molecular weight of 400 produced by the amination of polytetrahydrofuran with an average molecular weight of 250, preferably polyether amine D 230 (polyether amine on the basis of polypropylene glycol with an average molecular weight of 230), polyether amine D 400 (difunctional, primary polyether amine on the basis of polypropylene glycol with an average molecular weight of 400), polyether amine T 403 (polyether amine produced by the reaction of propylene oxide with trimethylolpropane followed by amination of the terminal hydroxyl groups with an average molecular weight of 403) or polyether amine T 5000 (polyether amine produced by the reaction of propylene oxide with glycerin followed by amination of the terminal hydroxyl groups with an average molecular weight of 5000). The hardened epoxy resins are molded bodies. The molded body contains reinforcing materials. The molded bodies are fiber reinforces. The molded body is a reinforced body parts for rotor blades of wind turbines. Preferred Definitions:    R1-R3, R5, R6 = H, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, phenyl or o-tolyl; and    R4 = methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, phenyl or o-tolyl.    EXAMPLE - Typical blend comprised of (in wt.%): polyetheramine D 230 (polyetheramine on the basis of propylene glycol with an average molecular weight of 230) (7.81); isophoronediamine (3.35); tetramethylguanidine (0.59); bisphenol-A-bisglycidylether (82); and butanediol-bisglycidylether (18).