The suitability of formulated films to act as a barrier against an external microbial contamination, at refrigerated temperature, was evaluated. Results obtained during storage at 7 ± 1 C are shown in Figs. 3 and 4. To evaluate the barrier activity of the films it is necessary to know whether or not the films allowed the passage of contamination into the cheese and if, simultaneously, these films could reduce or eliminate the contamination that occurred on their surface during storage.