In an effort to find the limit of crystallization of polypropylene, a series of quantitative and semiquantitative DSC experiments at rates up to 10,000 deg/min are described. Even at these fast rates polypropylene crystallized on cooling between 350±15 K and 280±6 K. No “fully amorphous” polypropylene was produced. No initial stage crystallization to the condis state could be proven by quenching after partial crystallization.