ISO 565:2014规定了在标准条件下确定尺寸纸张和纸板（包括瓦楞纤维板）的吸水率的方法。可能不适用于小于50克/平方米的纸张或压花纸。它不适用于诸如新闻纸或未标准纸张的多孔纸，例如吸水纸或具有较高吸水性的其它纸张，其中ISO 8787更合适。 该方法不是用于纸的书写性能的精确评估，尽管它给出了适用于水性油墨的一般指示

ISO 535:2014 specifies a method of determining the water absorptiveness of sized paper and board, including corrugated fibreboard, under standard conditions. It may not be suitable for paper of grammage less than 50 g/m2 or embossed paper. It is not suitable for porous papers such as newsprint or unsized papers such as blotting paper or other papers having a relatively high water absorptiveness for which ISO 8787 is more suitable. This method is not intended to be used for precise evaluation of the writing properties of paper although it does give a general indication of suitability for use with aqueous inks.