mould for a blow - moulding machine , for moulding thermoplastic containers , the mould comprising several mould parts having centring features and complementarily - shaped centring features , said centring features and complementarily - shaped centring lecture being capable of cooperating with one another , characterized in that at least a portion of at least one of the centring features and complementarily - shaped centring features is made or tin anti - friction composite material so as to avoid lubrication thereof .