Composition comprising A) 20.0 to 80.49 wt% of polycarbonate, B) 15.0 to 60.0 wt% of expanded graphite, the D(0.5) of the graphite, determined by sieve analysis according to DIN 51938, being < 1.2 mm, C) 4.5 to 10 wt% of at least one phosphorus compound of the general formula in which R 1, R 2, R 3 and R 4 independently of one another are C 1 - to C 8 -alkyl, in each case optionally halogenated and in each case branched or unbranched, and/or C 5 - to C 6 -cycloalkyl, C 6 - to C 20 -aryl or C 7 - to C 12 -aralkyl, in each case optionally substituted by a branched or unbranched alkyl and/or halogen, n independently at each occurrence is 0 or 1, q is an integer from 0 to 30, X is a monocyclic or polycyclic aromatic radical having 6 to 30 C atoms or is a linear or branched aliphatic radical having 2 to 30 C atoms, it being possible for the radical in each case to be substituted or unsubstituted, bridged or unbridged; D) 0.01 to 5.0 wt% of at least one ethylene/alkyl (meth)acrylate copolymer, E) optionally at least one further polymer additive, selected from the group of the heat stabilizers, flame retardants other than component C, antistats, colorants, pigments, mould release agents, UV absorbers, IR absorbers and/or fillers, selected from the group of chalk, quartz powder, titanium dioxide, silicates, aluminosilicates, aluminium oxide, silica, magnesium hydroxide and/or aluminium hydroxide, with components A) to E) adding up to 100 wt%. A) 20.0 to 80.49 wt% of polycarbonate, B) 15.0 to 60.0 wt% of expanded graphite, the D(0.5) of the graphite, determined by sieve analysis according to DIN 51938, being < 1.2 mm, C) 4.5 to 10 wt% of at least one phosphorus compound of the general formula in which R 1, R 2, R 3 and R 4 independently of one another are C 1 - to C 8 -alkyl, in each case optionally halogenated and in each case branched or unbranched, and/or C 5 - to C 6 -cycloalkyl, C 6 - to C 20 -aryl or C 7 - to C 12 -aralkyl, in each case optionally substituted by a branched or unbranched alkyl and/or halogen, n independently at each occurrence is 0 or 1, q is an integer from 0 to 30, X is a monocyclic or polycyclic aromatic radical having 6 to 30 C atoms or is a linear or branched aliphatic radical having 2 to 30 C atoms, it being possible for the radical in each case to be substituted or unsubstituted, bridged or unbridged; R 1, R 2, R 3 and R 4 independently of one another are C 1 - to C 8 -alkyl, in each case optionally halogenated and in each case branched or unbranched, and/or C 5 - to C 6 -cycloalkyl, C 6 - to C 20 -aryl or C 7 - to C 12 -aralkyl, in each case optionally substituted by a branched or unbranched alkyl and/or halogen, n independently at each occurrence is 0 or 1, q is an integer from 0 to 30, X is a monocyclic or polycyclic aromatic radical having 6 to 30 C atoms or is a linear or branched aliphatic radical having 2 to 30 C atoms, it being possible for the radical in each case to be substituted or unsubstituted, bridged or unbridged; D) 0.01 to 5.0 wt% of at least one ethylene/alkyl (meth)acrylate copolymer, E) optionally at least one further polymer additive, selected from the group of the heat stabilizers, flame retardants other than component C, antistats, colorants, pigments, mould release agents, UV absorbers, IR absorbers and/or fillers, selected from the group of chalk, quartz powder, titanium dioxide, silicates, aluminosilicates, aluminium oxide, silica, magnesium hydroxide and/or aluminium hydroxide, with components A) to E) adding up to 100 wt%.