However, if an improper treatment is applied, it may reduce the breathability and therefore inhibit the evaporation of sweat from skin, which may cause discomfort. There are various methods used to assess the water vapor permeability of textiles.
Comparison of Testing Methods for Water Vapor Permeability
ASTM E96 - Cup methods - Upright cup for water permeable fabric - Inverted cup for water impermeable fabric JIS L 1099 - Cup methods - Upright cup for water permeable fabric - Inverted cup for water impermeable fabric (for single membrane method) - Inverted cup for water permeable or water impermeable fabric (for double membrane method) ISO 15496 - Cup method - Inverted cup for water permeable or water impermeable fabric (double membrane method)
- Cup method - Only upright orientation - Cup is moving on a turntable
Various Water Vapor Permeability Testing Methods and Procedures
Water Vapor Transmission ASTM E96, JIS L 1099,ISO 15496, Water Vapor Permeability (WVP), BS 7209 and differences between BS 7209 and other cup methods as well as differences between cup methods and sweating hot plate methods are summarized within the latest Safeguards bulletin.
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