ABSTRACT
Special procedure: Measure of the porometry related to the nominal mass per unit area and dispersion
measure. This method shall be used for research and for special applications. For this determination granulometry of the passing particles is determined for
each sample separately. Test results must give:
— the identification of the product; — the mass per unit area for each specimen and the mean (g/m2); — the mean thickness under 2 kPa; — the granulometry of the particles passing through each specimen and namely d98,
d95 and d90 (µm); — the curve giving d95 versus the mass per unit area for each specimen; — the filtration opening for the nominal thickness (interpolation on the above
curve).
