BS EN ISO 534:2011

1   Scope This International Standard specifies two methods for measuring the thickness of paper and board:

       a)  the measurement of a single sheet of paper or board as a  single sheet thickness ; 
   
   
     
       b)  the measurement of a pack of sheets of paper as a  bulking thickness . 
   
 

This International Standard also specifies calculation methods

       —  for the  apparent sheet density  and for the  apparent bulk density , and 
   
   
     
       —  for the  apparent specific sheet volume  and for the  apparent specific bulk volume 

   
 

from the thickness determinations. This International Standard is not applicable to corrugated fibreboard. In addition, the measurement of bulking thickness , method b) above, is not suitable for board 1 .

   NOTE  The two methods generally lead to different results. These methods are not applicable to tissue paper and tissue products. For tissue paper and tissue products, [ISO 12625-3](/search?q=ISO%C2%A012625-3) should be used.