378 Roughness 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 T538. 
 
Samples range from 50 to 250 Sheffield units throughout the program year.
 
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.