Heat stabilized moulding composition

A thermoplastic moulding composition comprising:

• a) a polymer composition comprising at least one thermoplastic polyamide selected from the group consisting of polyamide-6, polyamide-6,6 and mixtures thereof having a weight average molecular mass Mw of at most 50,000 g/mol;
• b) 0.20 to 5 parts by weight (pbw) relative to 100 pbw of the polymer composition in the moulding composition of a first thermo-stabilizing system consisting of finely dispersed elementary iron powder having a weight average particle size (dm) of at most 100 μm;
• and
• c) 0.001-2 pbw relative to 100 pbw of the polymer composition in the moulding composition of a second thermo-stabilizing system consisting of a copper salt, wherein
• the moulding composition exhibits reduced deterioration when exposed to an elevated temperature of 215° C. for a prolonged time period of 500 hours as compared to an identical moulding composition including a CuI/KI stabilization system but not including the elementary iron powder.