Instruments for Testing Air Permeability
Thwing-Albert offers a variety of air permeability equipment with various testing capabilities suitable for many applications.
Bendtsen RL-BRAPT-A Roughness and Air Permeability Tester
The Bendtsen RL-BRAPT-A Roughness and Air Permeability Tester measures surface roughness and air permeability using the Bendtsen method to evaluate paper and board. This tester features a fully automated measuring cycle ranging from 25 to 5000 milliliters per minute. Other custom ranges are available upon request.
This instrument comes in three configuration options — one that measures roughness, one that measures porosity and one that measures both roughness and porosity.
Applicable standards include:
- ISO 5636-1
- ISO 5636-3
- ISO 8791-1
- ISO 8791-2
- BS 4420
- DIN 53108
- IS 9894
- SCAN P21
- SCAN P84
Gurley 4340 Automatic Densometer and Smoothness Tester
The 4340 Automatic Densometer and Smoothness Tester can measure air permeability, porosity or air resistance for various sheetlike materials. This system can use low, standard or high-pressure settings to produce accurate readings efficiently. An auto-drive mechanism with preprogramming capabilities enables automatic operation and analysis.
Applicable standards include:
- ASTM D726
- ISO 5636/5
- TAPPI T460
- TAPPI T490
- TAPPI T536
- TAPPI T538
Gurley Standard and Low-Pressure Densometers
Densometers are the most widely used instruments for measuring porosity in materials such as papers, plastics, wovens and membranes. These products measure the time a specific air volume flows through a material using uniform, light pressure. Gurley Standard and Low-Pressure Densometers are available in various model configurations — including manual and automatic units with different cylinder sizes — that are available depending on the specimen type.
Applicable standards include:
- ASTM D-726-58
- TAPPI T-460
- ISO 5636/5
- APPITA/AS 1301-420
- BS 5926
- CPPA D-14
- SCAN P-19
- SCAN P-53
Gurley High-Pressure Manual Densometers
High-pressure densometers are ideal when a low-pressure or standard model produces excessive measurement times. Gurley High-Pressure Densometers deliver readings up to 25 times faster than standard-pressure options. Several configurations are available based on your application's specific needs.
Applicable standards include TAPPI T-536-88 and ASTM D-726-58, Method B.
Discover More About Air Permeability Testing Equipment at Thwing-Albert
If you want to learn more about how our material testing equipment can benefit your operation, the experts at Thwing-Albert can help. We have supplied clients with the most accurate, reliable and durable measuring equipment for over a century. Contact us online today for a quote or additional product information.
