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Actually, there is an international standard for waterproof-ness of textiles, but it's only used in factories for QA. ISO 15496:2004 involves measuring the "water vapour permeability of textiles"....
Answer
Actually, there is an international standard for waterproof-ness of textiles, but it's only used in factories for QA. ISO 15496:2004 involves measuring the "water vapour permeability of textiles"....