3.4.4 testing the rate of vapour permeability, 1. bring the film to be cut into sheets, circle-diameter 7 cm. 2. cut the film successfully keep moisture control cabinet. Before bending permeation rate of steam. 3. measure the thickness of the film, to be used in the calculation of the rate of vapour permeability, 4. bring the silica gel in the Cup for WVTR and apply the Paste on the side of the film to the mouth of the Cup. 5. bring the ring and brought a heavy lead put on the ring, carrying an order not to let the mobile ring, then remove candle wax melted by the heat, pour around the ring to prevent water vapor to pass through it from the surrounding area. 6. start weighing and taking notes and keep the humidity control cabinet. 7. weigh the view changes every 1 HR since the trial started, and the notes until the weight is fixed.
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