The Vapometer is used for determining the water vapor permeability of sheet materials such as specialty paper grades, polyethylene, building material, leather, weatherproof clothing, vinyl, foil, laminates and other thin sheet materials. This property is essential in determining if a material is moisture proof or has the ability to protect contents from the transmission of water vapor.
Depending on the end use, water or a desiccant is placed in the base of the container. The specimen is then quickly sealed with the threaded flanged ring between the two neoprene gaskets and placed in a test chamber that controls the atmosphere. Vapor loss or gain is measured by recording the weight of the sample at different intervals over a period of time. The cups are serialized for an easy way to keep track of the different samples.