25.In water vapor permeability test each container is allowed to stand for a OA) 10 O B) 14 O C) 28 O D) 30
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Answer:
a
Explanation:
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Answer:
Option B) 14 days is the correct option.
Explanation:
The water vapor permeability test calculates the passage of water vapor through a material.
- At first, 5 containers are filled with a sufficient volume of water, and the bottles were sealed with aluminum foil by using heat.
- The weight of each container is accurately measured.
- Then each container is allowed to stand for 14 days at a relative humidity of approx. 60 ± 5% and a temperature of approx. 20 to 25 degrees celsius.
- The weight of the containers is measured again.
- Loss of weight in each container should not be more than 0.2 percent.
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