This International Standard specifies a method for determining the water absorption capacity of sized paper and board, including corrugated board, under standard conditions. It may not be suitable for paper with a weight per unit area of less than 50 g/m2 or for embossed paper. It is unsuitable for porous paper such as newsprint or unsized paper such as blotter or other papers with a relatively high water absorption capacity. ISO 8787 is more suitable for this. This method is not intended to accurately assess the writing properties of papers, although it does provide a general indication of suitability when using aqueous inks.
EN ISO 535:2014 Referenced Document
ISO 186:2002 Paper and board - Sampling to determine average quality
ISO 187:1990 Paper, board and pulps; standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples
ISO 5269-1:2005 Pulps - Preparation of laboratory sheets for physical testing - Part 1: Conventional sheet-former method
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results - Part 1: General principles and definitions
ISO 8787:1986 Paper and board; Determination of capillary rise; Klemm method
ISO/TR 24498:2006 Paper, board and pulps - Estimation of uncertainty for test methods
EN ISO 535:2014 history
2023EN ISO 535:2023 Paper and board - Determination of water absorptiveness - Cobb method (ISO 535:2023)
2014EN ISO 535:2014 Paper and board - Determination of water absorptiveness - Cobb method
EN ISO 535:2014 Paper and board - Determination of water absorptiveness - Cobb method has been changed from EN 20535:1994 Paper and Board - Determination of Water Absorptiveness - Cobb Method (ISO 535 :1991).