The bubble point test is a widely used measurement method in filter media quality control. The basic principle is that pores filled with liquid only become permeable for gas from a certain pressure level upwards. This pressure level is measured and then used to deduce the pore size.
 
The problem is that the underlying correlation between pressure and pore size is only valid for cylindrical pores. To determine the size of pores with other shapes, correction factors are applied. Up to now, these have been determined empirically or simply estimated.
 
By using the CFD-simulations of the bubble point test, GKD - GEBR. KUFFERATH AG has developed a procedure that offers a precise and quick pore size determination for all common weave types. This procedure not only supports quality control in terms of production, it also contributes to the development of new weave types.