International Organization for Standardization (ISO)
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ISO 5633:1983
Scope
Is applicable to papers and boards which have been rendered water resistant or waterproof by internal sizing, by surface sizing, by coating, or by lamination using waterproof laminants , or by any other method, and is not suitable for corrugated fibreboard by may be applied to components of such board.
ISO 5633:1983 history
1983ISO 5633:1983 Paper and board; Determination of resistance to water penetration