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Metals • Plastics • Rubbers • Polymers • Ceramics • Composites
Metals • Plastics • Rubbers • Polymers • Ceramics • Composites • Coatings
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  • materials.co.uk
  • materials.co.uk
  • materials.co.uk
  • materials.co.uk

AIR PERMEABILITY

Description

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.

Specification
Air volume2.5 to 30cc
Air pressure12.33 inches WC
(3 kPa approx)
Sample area1.00 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.)
Standards
(ASTM D726-94(2003))Standard Test Method for Resistance of Nonporous Paper to Passage of Air
TAPPI T 536 om-18Resistance of Paper to Passage of Air (High Pressure Gurley Method)
Gurley 4150
Gurley 4150 Air Permeability Tester