DIN EN ISO 12625-8:2011-04

This part of ISO 12625 describes one principle for the determination of water-absorption properties of tissue paper and tissue products. It is a principle in which sheets of a sample are inserted in a cylindrical basket, which is then immersed in water. The results are expressed as: - water-absorption time, or - water-absorption capacity. In European and international trade, both water-absorption time and water-absorption capacity represent important parameters in the field of comparison of tissue products. Both manual and automated test methods exist, but the procedure described in this part of ISO 12625 refers to manual devices only. The reason is that precision results obtained with the different automatic methods included in an interlaboratory study were not acceptable compared with the results obtained using the manual testing method. Nevertheless, automated test methods may be used, provided that they can be shown to give the same results as the manual method, in terms of average values and standard deviations.