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It is used to determine the water performance of the plastic drain board. The length of the sample is 330mm, the thickness of the latex film is 0.3mm, and the 350Kpa pressure is added to the sample when the sample is required.

The instrument is composed of osmotic bin, water supply valve, upstream and downstream container, overflow pipe, rubber ring, latex film, pressure gauge, pressure reducing valve, regulating tube, water level ruler and rigid pad.

1, Load the specimen with the length direction as the CIS.
2, Add pressure to the osmosis chamber, and keep the pressure in the permeable bin 0.02Kpa.
3, Adjust the water supply valve, so that the water entering the upstream container is more than that of the fabric sample. The overflow pipe should always overflow with water to keep the water surface in the cylinder unchanged.
4, The hydraulic gradient is selected according to the test regulations: the upstream and downstream water level vessel is adjusted to make it reach the specified hydraulic gradient.
5, In the process of percolation, we should keep constant water head.
6, Start the stopwatch, while using a ground for water infiltration in a certain period of time, access, adjusting pipe shall not be immersed in a water.
7, Repeat step 1~6 three times.
8, Remove the sample, reinstall a new set of samples and repeat step 1~7.