The invention relates to compositions containing (I) at least two components selected from the group of aromatic poly(ester)carbonates, polymers grafted from at least one vinyl monomer onto one graft base having a glass transition temperature 10°C, thermoplastic vinyl(co)polymer or polyalkylene terephthalate, and (II) between 0.5 and 25wt. parts of a mixture of phosphorous compounds of general formula (I), provided that said compositions at least 2 phosphorous compounds of formula (I) wherein X or at least one radical R1, R2, R3 and R4 are different and the sum of the weight parts of all of the components amounts to 100.
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