Fibre composite material comprising at least one layer of fibre material embedded into a composition comprising A) at least 55% by weight of at least one aromatic polycarbonate, B) 5% by weight to 11% by weight of at least one quartz and/or quartz glass, C) 4% by weight to 15% by weight of at least one cyclic phosphazene of formula where R is the same or different and is an amine radical, an in each case optionally halogenated C 1 - to C 8 -alkyl radical, C 1 - to C 8 -alkoxy radical, in each case optionally alkyl- and/or halogen-substituted C 5 - to C 6 -cycloalkyl radical, in each case optionally alkyl- and/or halogen- and/or hydroxyl-substituted C 6 - to C 20 -aryloxy radical, in each case optionally alkyl- and/or halogen-substituted C 7 - to C 12 -aralkyl radical or a halogen radical or an OH radical, k is an integer from 1 to 10, D) 3% to 12% by weight of at least one phosphorus compound of the general formula where R 1, R 2, R 3 and R 4 are each independently a C 1 - to C 8 -alkyl radical, in each case optionally halogenated and in each case branched or unbranched, and/or C 5 - to C 6 -cycloalkyl radical, C 6 - to C 20 -aryl radical or C 7 - to C 12 -aralkyl radical, in each case optionally substituted by branched or unbranched alkyl and/or halogen, n is independently 0 or 1, q is an integer from 0 to 30, X is a mono- or polycyclic aromatic radical having 6 to 30 carbon atoms or a linear or branched aliphatic radical having 2 to 30 carbon atoms, each of which may be substituted or unsubstituted, and bridged or unbridged. A) at least 55% by weight of at least one aromatic polycarbonate, B) 5% by weight to 11% by weight of at least one quartz and/or quartz glass, C) 4% by weight to 15% by weight of at least one cyclic phosphazene of formula where R is the same or different and is an amine radical, an in each case optionally halogenated C 1 - to C 8 -alkyl radical, C 1 - to C 8 -alkoxy radical, in each case optionally alkyl- and/or halogen-substituted C 5 - to C 6 -cycloalkyl radical, in each case optionally alkyl- and/or halogen- and/or hydroxyl-substituted C 6 - to C 20 -aryloxy radical, in each case optionally alkyl- and/or halogen-substituted C 7 - to C 12 -aralkyl radical or a halogen radical or an OH radical, k is an integer from 1 to 10, R is the same or different and is an amine radical, an in each case optionally halogenated C 1 - to C 8 -alkyl radical, C 1 - to C 8 -alkoxy radical, in each case optionally alkyl- and/or halogen-substituted C 5 - to C 6 -cycloalkyl radical, in each case optionally alkyl- and/or halogen- and/or hydroxyl-substituted C 6 - to C 20 -aryloxy radical, in each case optionally alkyl- and/or halogen-substituted C 7 - to C 12 -aralkyl radical or a halogen radical or an OH radical, k is an integer from 1 to 10, D) 3% to 12% by weight of at least one phosphorus compound of the general formula where R 1, R 2, R 3 and R 4 are each independently a C 1 - to C 8 -alkyl radical, in each case optionally halogenated and in each case branched or unbranched, and/or C 5 - to C 6 -cycloalkyl radical, C 6 - to C 20 -aryl radical or C 7 - to C 12 -aralkyl radical, in each case optionally substituted by branched or unbranched alkyl and/or halogen, n is independently 0 or 1, q is an integer from 0 to 30, X is a mono- or polycyclic aromatic radical having 6 to 30 carbon atoms or a linear or branched aliphatic radical having 2 to 30 carbon atoms, each of which may be substituted or unsubstituted, and bridged or unbridged. R 1, R 2, R 3 and R 4 are each independently a C 1 - to C 8 -alkyl radical, in each case optionally halogenated and in each case branched or unbranched, and/or C 5 - to C 6 -cycloalkyl radical, C 6 - to C 20 -aryl radical or C 7 - to C 12 -aralkyl radical, in each case optionally substituted by branched or unbranched alkyl and/or halogen, n is independently 0 or 1, q is an integer from 0 to 30, X is a mono- or polycyclic aromatic radical having 6 to 30 carbon atoms or a linear or branched aliphatic radical having 2 to 30 carbon atoms, each of which may be substituted or unsubstituted, and bridged or unbridged.