The Hydrohead option simulates the height of water which the sample will support before a predetermined amount of liquid passes through.

To simulate Hydrohead we use the POROLUX 1000 in it’s unique bubble-point measuring mode. Once the sample is in the sample holder,  a small volume of water is added above the hydrophobic sample. Then the pressure on the sample is slowly increased by a small, constant flow of gas. At the moment the water is pushed through the sample there will be a change in the linear pressure increase. This change can be regarded as the Hydrohead pressure.