and fill with the moisture absorption agent until it is approximately 3mm
from the top of the cup. Next place a testpiece with its front surface facing
the moisture absorption agent and direct it so as to form a concentric circle
with the water vapor permeable cup. Attach the packing and ring to the testpiece
and fix with the wing nut. Then seal the packing/ring side with vinyl adhesive
tape to prepare a test body. Put this test body in the thermohygrostat in
which air at 40
2,
905% RH circulates.
After 1 hour, remove the test body and immediately measure its mass a1 (mg).
Again put this test body in the thermohygrostat, remove it after 1 hour,
and measure the mass a2 (mg) immediately. 
Where P = water vapor permeability (g/hr.) S = water vapor permeable area (
)
Repeat the above procedure three times and take the average (up to the integer place) of the calculated values.
|
|
 |
|