1. Water Vapor Transmission of Laminate Film for CS Packages Uno M. Nagoya Univ.

2. CS need keeping wet for refresh. But laminate film may not be enough. CS package film: PET 15μm/Al 7μm/PE 60μm Al is originally perfect against water vapor. But Al foil has pinhole (~ 10/m 2 ). And the face of seal part isn’t covered with Al.  So we have to check.

3. Set Up Size; 12.5×10cm 2 (opera emulsion) Contents;  sample cotton wool+water (2g)  reference cotton 20 packages for each type Storage environment; 40˚C (Yamato Program Incubator IN61) —watching the change of weight of these packages.

4. Weigh these packages Electronic Balance (AND FA-200) max = 210g min scale = 0.001g —weighing Al cluster every time to check the state of the balance. —These changes are so small that I weigh 20 packages at the same time. σ 0.0014g

5. Weight of Packages 10mg

6. Weight of Packages and Humidity

7. Weight of packages depend on humidity. In fact, PET is generally absorbent (0.1-2.5%). 20%  45%

8. Value of “sample – reference” Laminate film is good for CS packages ! Requirement; <0.1g/5years/1pack  <0.0011g/day/20packs