Scope
1.1 This method is used to measure the air resistance of approximately 6.45 sq. cm. (l sq. in.) circular area of
paper using a pressure differential of 1.22 kPa. The recommended range of the liquid column instrument is from 5 to
1800 seconds per 100 mL cylinder displacement. For more impermeable papers the time requirements become so
excessive that other techniques are preferable.
1.2 This method measures the volume of air that passes through the test specimen, along with any possible
leakage of air across the surface; therefore it is unsuitable for paper or paperboards which cannot be securely clamped so
as to avoid significant surface and/or edge leakage.
1.3 For a similar method of measuring air resistance that tests paper at a higher pressure (approx. 3 kPa), and
has higher resolution in measuring smaller air volumes, refer to TAPPI T 536. For a method of measuring air permeance
at pressures up to 9.85 kPa, using both smaller and larger test areas, refer to TAPPI T 547.
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| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 7 |
| Published : | 01/01/2011 |
