Permeability measurements for filter media are widely used in the industry. Especially air permeability measurements are a standard characteristic which is also included in most specification sheets of various filter media manufacturers.

Woven filter media is widely used in liquid solid separation. Despite this fact there is no standardized liquid medium permeability test focusing on filtration media which is widely used in the industry.

As water or water-based liquids are the dispersion medium in many solid-liquid separation processes, GKD has decided to build a water permeability testing bench, to be able to determine reliable values for the water permeability of a filter medium.

Although developed for woven filter materials, the test bench can be utilized to test all kins au permeable materials. The only limitation is the fact, that the test bench uses hydrostatic pressure for measurements, making it difficult to test ultra fine materials, such as membranes.

This presentation intends to show the challenges of construction, explain the measurement techniques that are used in accordance to DIN EN ISO 11058 and illustrate the possibilities that the data recorded provides for manufacturers as well as customers...