scope:

This International Standard specifies a method for the determination of the fluid permeability of permeable sintered metal materials in which the porosity is deliberately continuous or interconnecting, testing being carried out under such conditions that the fluid permeability tan be expressed in terms of viscous and inertia permeability coefficients (see annex A). This International Standard does not apply to very long hollow cylindrical test pieces of small diameter, in which the pressure drop of the fluid in passing along the bore of the cylinder may not be negligible compared with the pressure drop of the fluid passing through the wall thickness (sec annex A, clause A.5).