The i-Hydro 7500 Water Vapor Transmission Rate Testing System can determine the water vapor transmission rate of various materials like plastic films, composite films, sheets, and more. The test involves mounting a specimen in the outer test chamber and measuring the rate of water vapor permeation. The system controls humidity and gas flow rates during testing. Test results and reports can then be viewed to obtain the water vapor transmission rate of specimens.

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i-Hydro 7500 Water Vapor Transmission Rate Testing System---Film Test
Scope
i-Hydro 7500 Water Vapor Transmission Rate Testing System is designed to determine the water vapor transmission rate of
plastic films, composite films, sheets, high barrier materials, solar back sheets, aluminum foils, waterproof membrane and
bottles, cans and boxes made of plastics, rubber, glass, paper and other metal materials.
Test Procedures
A: Prepare the film specimen according to specific standard. The test specimen should have uniform thickness and be free
of wrinkles, creases or other visible defects. Identify the permeating direction of the test and if necessary, mark the
permeating direction on the test specimen. Generally the water vapor permeates from the outside in. Mount the test
specimen to the outer test chamber as shown in Figure below.

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B: Apply a layer of vacuum grease on the flange of the outer test chamber and then install the outer test chamber on the
integrated inner test chamber and tighten it.
C: Check the tubing connection. Turn the stop valve to “ON” position and adjust the pressure regulator until the output
pressure gauge indicates 0.15 MPa.

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D: Observe the water level through the sight glass. If the water level is less than 1/3, please inject distilled water with
syringe from the water injection port until the water level reaches 2/3 of the chamber. Then tighten the screws with Allen
wrench.
E: Set up test parameters. Select specimen type “Film” and start the test.

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F: In process of testing, the user could adjust the humidity to desired value by turning the pressure adjustment knob in
clockwise or counterclockwise direction. It usually takes 20 minutes to reach a stabilized humidity.
G: Observe the flow of each test cell in process of testing. The flow of Cell A, B, C and Zero should be 100±2 ml/min and
the flow of humidified gas should be 90~100 ml/min. Otherwise the flow should be adjusted by turning the valves in
clockwise or counterclockwise direction. Turn in clockwise direction to decrease the flow, while counterclockwise direction
to increase the flow. The flow rate of humidified gas would not be displayed in test interface. A rotameter should be inserted
into the multi-port to check the flow rate of humidified gas. The rotameter should not stay in the multi-port for a long time.

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H: View the test results and reports. If necessary, repeat the above procedures to perform another round of tests.