Test principle
Desiccant inside the specimen cup (weight gain method) or place water (weight loss method); seal the specimen cup with the specimen and place it inside the test chamber; control the temperature, humidity and wind speed of the test chamber; the difference of humidity inside and outside the specimen cup, drive the water vapor to penetrate the specimen, the mass of the specimen cup increases or decreases; weigh the mass of the specimen cup at regular intervals and calculate the water vapor transmission amount of the specimen and other performance parameters.
Standard
ASTM E96、GB/T 1037、ASTM D1653、ISO 2528、TAPPIT464、DIN 53122-1、YBB00092003
Technical parameters