By studying various test methods of water vapor transmission rate, Labthink manufactures many water vapor permeability testing instruments based on ASTM E96/GB 1037 (gravimetric method), ISO 15106-2/ASTM F1249 (infrared sensor method), ISO15106-3 (electrolytic sensor method) and ISO15106-1/ASTME398 (humidity sensor method). Labthink has the most complete product line of water vapor permeability testing instruments in packaging industry worldwide.
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.
It is also known as water vapor transmission rate (WVTR) or moisture vapor transmission rate (MVTR).
W3/062 is based on cup method to measure water vapor transmission rate of plastic films, foils and finished packages. It has Six independent testing cells and can be easily connected with 9 satellite systems.
W3/031 is professionally applicable to the water vapor transmission rate test of film specimens. It is equipped with three individual test dishes and the testing process is completely automatic and conforms to international standards.