372 Air Resistance/Porosity Price: $306.00


Participants receive two similar samples for testing. Each sample consists of ten pre-conditioned 4 1/4" x 5 1/2" sheets that are tested using TAPPI Method T547. 
 
Participants are instructed to use the 3/4" diameter orifice.
 
Enroll at any time; your subscription will start with the next scheduled shipping date and will include six (6) shipments.
 
Testing conducted during February, April, June, August, October and December.