The migration of the antioxidantn‐octadecyl 3‐(3,5‐di‐tert‐butyl‐4‐hydroxyphenyl)‐propionate from various plastics into the test fat HB 307 was investigated. Plastics from the following classes were included: high‐impact polystyrene (HIPS), polypropylene (PP), high‐and low‐density polyethylene (HDPE and LDPE), and were found to have distinctly different properties—in particular, different densities, melt flow indices and structural characteristics.