Gas permeability is the ability of a barrier material to allow gases (O2, N2, CO2 etc.) to permeate through it in a specific time. Gas permeability may vary with temperature, humidity, pressure and specimen thickness.
Water vapor permeability is a measure of the passage of water vapor through a membrane. It is the rate of water vapor transmission per unit area per unit of vapor pressure differential under test conditions.
C360M aslo Water Vapor Permeability Tester, is designed and manufactured based on the gravimetric determination method and conforms to the requirements of ASTM E96.
C390, also water vapor permeation analyzer, is designed and manufactured based on infrared sensor method and conforms to the requirements of ISO 15106-2 and ASTM F1249.
C230 Oxygen Transmission Rate (OTR) Tester is designed and manufactured based on the coulometric sensor method (aka. equal pressure method) and conforms to ASTM D3985.