The invention relates to condensation products obtained by condensation of (A) of mixture comprising (a) a triazine of the general formula (I), in which R is C1-C6 alkyl, unsubstituted phenyl or phenyl substituted up to three times with C1-C4 alkyl, p-hydroxy phenyl or o-hydroxy phenyl, and C1-C4 alkyl substituted with phenyl, or mixtures thereof, and (b) a mixture comprising (b1) a triazine of the general formula (II), in which Rx is C1-C6 alkyl, unsubstituted phenyl or phenyl substituted up to three times with C1-C4 alkyl, and C1-C4 alkyl substituted with phenyl, and Y' is -NHZ, Z being selected from the group comprising hydroxy-C2-C10-alkyl, hydroxy-C2-C4-alkyl-(oxa-C2-C4-alkyl)m, where m is 1 to 5, -NHCH2CH2SCH2CH2OH and amino-C2-C12-alkyl, or mixtures thereof, and (b2) a substituted melamine of the general formula (III), in which X, X' and X'' are selected from the group comprising -NH2, -NHR' and -NH'R'', in which X, X' and X'' are not simultaneously either -NH2 or -NH'R'', and R' and R'' are selected from the group comprising hydroxy-C2-C10-alkyl, hydroxy-C2-C4-alkyl-(oxa-C2-C4-alkyl)n, where n is 1 to 5, and amino-C2-C12-alkyl, or mixtures thereof, and optionally; (B), unsubstituted phenols or phenols substituted with radicals selected from the group comprising C1-C9 alkyl and hydroxy, C1-C4 alkanes substituted with two or three phenol groups, di(hydroxyphenyl)sulphones or mixtures of said phenols, with formaldehyde or formaldehyde-supplying compounds. The invention also relates to a process for preparing said condensation products, the use thereof for producing moulded bodies, in particular fibres, and moulded bodies, in particular fibres and foamed materials, obtained with this process.