Polymer composition suitable for gamma-ray sterilization

A polymer composition (C), comprising, based on the total weight of the polymer composition (C):

• (a) 91.0 to 98.0 wt.-% of a propylene homopolymer (H-PP),
• (b) 1.98 to 8.98 wt.-% of at least one hydrocarbon oil (WO),
• (c) 0.01 to 0.7 wt.-% of at least one nucleating agent (NA), and
• (d) 0.01 to 2.0 wt.-% of at least one antioxidant (AO);
• wherein the sum of components (a), (b), (c) and (d) adds up to at least 95 wt.-% of the total weight of the polymer composition (C) and the propylene homopolymer (H-PP) is an isotactic propylene homopolymer defined by
• (i) a melt flow rate MFR2 determined according to IS01133 at 230 ° C. and 2.16 kg in the range from 4.0 to 22.0 g/10 min;
• (ii) a melting temperature in the range of 145 to 162° C. as determined by differential scanning calorimetry (DSC);
• and
• (iii) a content of 2,1 erythro regio-defects in the range from 0.1 to 1.3 mol % as determined by 13C-NMR spectroscopy.