Breatability A-1 method JIS L1099


Put a lid on the cup filled with calcium chloride (moisture absorbent) by specimen:

Put the cup inside of the drum with constant temperature and humidity (40°C 90%RH)

Every certain minute, measure the change of the cup’s weight. Then, calculate breathability from the quantity of vapor which goes through the specimen and is captured into the absorbent. This method is appropriate to measure the breathability of fabric when people wear it.