TAPPI T 460
2011 Edition, January 1, 2011
Air resistance of paper (Gurley method)
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2016 Edition, May 1, 2016
STANDARD TEST METHOD FOR MICROBIAL RANKING OF POROUS PACKAGING MATERIALS (EXPOSURE CHAMBER METHOD)
Description / Abstract:
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