This standard specifies the method for the determination of the mass gain of paper and board after immersion in water or other solutions for a certain period of time. This standard applies to all kinds of paper and paperboard, especially paper and paperboard treated to a certain degree of waterproofing.
GB/T 461.3-1989 history
2005GB/T 461.3-2005 Paper and board--Determination of water absorption(immersion in water)
1989GB/T 461.3-1989 Determination of absorbency of paper and board (water immersion method)