Guangzhou Biaoji Packaging Equipment Co,ltd

The W405L water vapor transmittance tester adopts the infrared method. The pre-treated specimen is fixed in the middle of the test chamber, the test chamber is divided into high humidity side and low humidity side, compressed air flows on one side of the film, dry nitrogen (carrier gas) flows at a fixed retention speed on the other side, due to the presence of humidity gradient, water vapor will penetrate from the high humidity side to the low humidity side, and the water vapor through the specimen is carried to the infrared sensor by the flowing dry nitrogen, and the water vapor transmittance of the specimen is obtained by the electrical signal output to the sensor.
ASTM F 1249
ISO 15106-2