Fireproof molding masses.

The invention relates to compounds of FORMING THERMOPLASTIC comprising A) 30 to 96% by weight of a polyester, B) from 1 to 30% ON WEIGHT melamine cyanurate, C) from 1 A 30% BY WEIGHT OF PHOSPHOR at least one agent fireproofing, D) from 0.01 to 5% by weight of at least one ester of aliphatic carboxylic acids PIPERAZIN, saturated or unsaturated, with 10 to 40 carbon atoms, with saturated aliphatic alcohols or amines 2 to 40 carbon atoms, yE) between 0 and 60% by weight of other additives and auxiliaries for treatment. TOTAL PERCENTAGE BY WEIGHT OF COMPOUNDS A) AE) is 100%.