1 Drop, 3 Drop
The test fabric is placed into the machine and the plunger is lowered to provide a watertight seal. Then the operator opens the valve, allowing the water to flow. The actuator is turned on, raising the arm, and causing the water column to rise. The higher the water column, the more pressure is exerted on the fabric. Here, you can see the underside of the fabric. Please note: the drips you see on the side of the metal tray are not from the water passing through the fabric but instead a byproduct of the testing process on the top of the sample. It is not relevant to the test itself. Toward the end of the test, a look at the fabric shows small beads of water forming and consequent drips. At the moment in time when 3 drops of water appear on the underside of the fabric, the corresponding height of the water column at that time is measured.