The test films were previously equilibrated at 25◦C and 50% RH for 2 h.Then, the films were sealed with paraffin and rubber on the test acrylic cups, which measured 40 mm in diameter and 25 mm in depth.
The test films were previously equilibrated at 25◦C and 50% RH for 2 h.Then, the films were sealed with paraffin and rubber on the testacrylic cups, which measured 40 mm in diameter and 25 mm in depth.