Breatability B-1 method JIS L1099


Put a lid on the cup containing solution of potassium acetate (moisture absorbent) by supporting film:

Hold the cup on the specimen so that specimen is soaked 10cm in the water below

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 maximum breathability of fabric.