through polyamide films, with and without
microparticles, were obtained using an OX-Tran 2/20 (Mocon
Inc., Minneapolis, MN, USA) at 23 8C; 0% RH and 1 atm (ASTM
F1927). The detection limit of the instrument was
0.05 cm3 m2 d1. The system was operated according to
ASTM D 3985.