Model 643 Combination CGSB/VBW Water Vapour Diffusion Apparatus - cont'd 2

Cell Set Up Positions

When set up in the CGSB mode,the wet membrane, typically made from teflon, is above the test specimen and the dry membrane, also made from teflon, is below the specimen.

In VBW mode the dry membrane, typically made from teflon, is above the test specimen and the wet membrane, made from filter paper, is below the specimen.

Cell Features

• specimen position can be adjusted anywhere in the test gap from right up against the wet membrane to right up against the dry membrane from outside the cell and without opening it.
• the cell can be used for making absolute measurements of the water vapour diffusion of a wide range of textile materials including those that have microporous or hydrophilic laminations or coatings.
• the moisture mass flow measurement can be made using a weight measurement method or a volume measurement method.
• measurements are made without opening the cell. This means no disturbance of the atmosphere in the cell during a test leading to more reliable results.

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