International Organization for Standardization (ISO)
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ISO 5637:1989
Scope
Is applicable to all types of paper and board which have a degree of water resistance, and it is not applicable to very absorbent papers such as toilet tissue.
ISO 5637:1989 history
1989ISO 5637:1989 Paper and board; determination of water absorption after immersion in water
1978ISO 5637:1978 Paper and board — Determination of water absorption and increase in thickness after immersion in water