The Gurley 4150 is a high pressure densometer intended to measure the air permeability of materials with low air permeability.
The densometer measures the time taken for a given volume of air at constant pressure to pass through a defined area of the test specimen. The sample is clamped between plates containing a circular orifice and therefore, the surface of the specimen must be smooth to avoid leakage of air across the surface.
The air pressure is supplied by a weighted inner cylinder floating freely within an outer cylinder which is partially filled with oil to act as a seal. The time is measured with a digital timer.
Typical materials include coated papers, plastics and membranes.
|
| Air volume | 2.5 to 30cc |
| Air pressure | 12.33 inches WC
(3 kPa approx) |
| Sample area | 1.00 sq inch (6.4 sq cm approx.)
0.25 sq inch (1.6 sq cm approx.)
0.10 sq inch (0.64 sq cm approx.) |
| ASTM D726-94(2003) | Standard Test Method for Resistance of Nonporous Paper to Passage of Air |
TAPPI T 536 om-02 | Resistance of Paper to Passage of Air (High Pressure Gurley Method) |
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