A curable composition comprising - at least one polyamide selected from the group consisting of PA6, PA11, PA12, PA66, PA610, PA612, PA1010, PA1012, and copolymers thereof, - at least one organic peroxide, preferably selected in the group consisting of diacyl, peroxydicarbonate, endo, dialkyl, peroxyketal, peroxyester, monoperoxycarbonate, trioxepane peroxide, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, m/p-di(t-butylperoxy)diisopropylbenzene, di-t-butylperoxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, dicumyl peroxide, t-butylperoxybenzoate, 1,1-di(t-butylperoxy)-3,3,5-trimethyl cyclohexane, 1,1-di(t-butylperoxy) cyclohexane, n-butyl-4,4-di(t-butylperoxy)valerate, ethyl 3,3-di(t-butylperoxy)butyrate, t-butyl peroxyacetate, OO-t-butyl-O-2-ethylhexyl monoperoxycarbonate, OO-t-butyl-O-isopropyl monoperoxycarbonate, polyether polyt-butylperoxycarbonate, 3,3,5,7,7-pentamethyl-1,2,4-trioxepane, and 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane; and - a coagent containing one or more sites of unsaturation per molecule capable of participating in a free radical reaction, which is selected from coagents of the acrylic, methacrylic, allylic, vinyl, norbornene and bismaleimide types and class 2 coagents having at least one allylic group and/or aromatic group; and/or a free radical trap selected from the group consisting of hydroquinones, quinone compounds and nitroxide free radicals, TEMPO free radicals, 4- hydroxy TEMPO free radical, TEMPO-polymer bound or PS-TEMPO free radicals, 4-(2-bromoacetamido)-TEMPO free radical, 4-(2-iodoacetamido)-TEMPO free radical, 4-acetamido-TEMPO free radical, 4-amino-TEMPO free radical, 4-carboxy-TEMPO free radical, 4-hydroxy-TEMPO benzoate free radical, 4-maleimido-TEMPO free radical, 4-methoxy-TEMPO free radical, 4-oxo-TEMPO free radical, 4-phosphonooxy-TEMPO hydrate free radical, PROXYL free radicals, 3-(2-iodoacetamido)-PROXYL free radical, 3-[2-(2-maleimidoethoxy)ethylcarbamoyl]-PROXYL free radical, 3-carbamoyl-PROXYL free radical, 3-cyano-PROXYL free radical, 3-maleimido-PROXYL free radical, 3-(2-bromo-acetoamido-methyl)-PROXYL free radical, 3-(2-(2-iodoacetamido)acetamido)-PROXYL free radical, 3-(2-isothiocyanato-ethyl-carbamoyl)-PROXYL free radical, 3-(3-(2-iodoacetamido)-propylcarbamoyl)-PROXYL free radical, and hindered phenol antioxidant type radical scavengers, said curable composition being substantially free of peroxide-reactable polyolefin and/or rubber. - at least one polyamide selected from the group consisting of PA6, PA11, PA12, PA66, PA610, PA612, PA1010, PA1012, and copolymers thereof, - at least one organic peroxide, preferably selected in the group consisting of diacyl, peroxydicarbonate, endo, dialkyl, peroxyketal, peroxyester, monoperoxycarbonate, trioxepane peroxide, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, m/p-di(t-butylperoxy)diisopropylbenzene, di-t-butylperoxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, dicumyl peroxide, t-butylperoxybenzoate, 1,1-di(t-butylperoxy)-3,3,5-trimethyl cyclohexane, 1,1-di(t-butylperoxy) cyclohexane, n-butyl-4,4-di(t-butylperoxy)valerate, ethyl 3,3-di(t-butylperoxy)butyrate, t-butyl peroxyacetate, OO-t-butyl-O-2-ethylhexyl monoperoxycarbonate, OO-t-butyl-O-isopropyl monoperoxycarbonate, polyether polyt-butylperoxycarbonate, 3,3,5,7,7-pentamethyl-1,2,4-trioxepane, and 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane; and - a coagent containing one or more sites of unsaturation per molecule capable of participating in a free radical reaction, which is selected from coagents of the acrylic, methacrylic, allylic, vinyl, norbornene and bismaleimide types and class 2 coagents having at least one allylic group and/or aromatic group; and/or a free radical trap selected from the group consisting of hydroquinones, quinone compounds and nitroxide free radicals, TEMPO free radicals, 4- hydroxy TEMPO free radical, TEMPO-polymer bound or PS-TEMPO free radicals, 4-(2-bromoacetamido)-TEMPO free radical, 4-(2-iodoacetamido)-TEMPO free radical, 4-acetamido-TEMPO free radical, 4-amino-TEMPO free radical, 4-carboxy-TEMPO free radical, 4-hydroxy-TEMPO benzoate free radical, 4-maleimido-TEMPO free radical, 4-methoxy-TEMPO free radical, 4-oxo-TEMPO free radical, 4-phosphonooxy-TEMPO hydrate free radical, PROXYL free radicals, 3-(2-iodoacetamido)-PROXYL free radical, 3-[2-(2-maleimidoethoxy)ethylcarbamoyl]-PROXYL free radical, 3-carbamoyl-PROXYL free radical, 3-cyano-PROXYL free radical, 3-maleimido-PROXYL free radical, 3-(2-bromo-acetoamido-methyl)-PROXYL free radical, 3-(2-(2-iodoacetamido)acetamido)-PROXYL free radical, 3-(2-isothiocyanato-ethyl-carbamoyl)-PROXYL free radical, 3-(3-(2-iodoacetamido)-propylcarbamoyl)-PROXYL free radical, and hindered phenol antioxidant type radical scavengers,