Porosity-Gurley module measures the air permeability of paper and reports the result in Gurley porosity (µm/Pas or sec/100 ml).
Measuring range
| Porosity-G [µm/Pas] | 0.20–50 |
| Porosity-G [s/100 ml] | 2.5–650 |
| Meas. head diameter | 28.7 mm (1.13”) |
| Measuring pressure | 12.2 mbar (1.22 Pa, 0.177 psi) |
Measurement according to standards ISO 5636-5, TAPPI T460, JIS P 8117. Related standards: ASTM D726, APPITA AS 1301-420, CPPA D.14, BS 5926.