Evaporative Resistance and Moisture Vapour Transmission Testing
category
Evaporative resistance testing quantifies the resistance of fabrics and clothing to the passage of water vapour — the property that determines how effectively sweat evaporation can occur through the textile to cool the body during physical activity. The ISO 11092 sweating guarded hotplate method measures evaporative resistance by supplying water to the heated plate surface, measuring the power required to evaporate moisture through the specimen under standardised vapour pressure gradient conditions. The moisture vapour transmission rate expresses breathability as mass of water vapour transmitted per unit area per unit time, used alongside evaporative resistance for product labelling and specification. Waterproof breathable membranes such as expanded PTFE and hydrophilic polyurethane demonstrate the critical balance between liquid water impermeability and water vapour permeability that defines modern high-performance outerwear.
Role
Evaporative resistance testing is the defining performance measurement for breathable fabrics used in rainwear, sportswear, and protective clothing — quantifying the moisture management capability that determines whether wearers experience heat stress and sweat accumulation during physical activity, and providing the objective breathability data that underpins performance marketing claims and regulatory compliance for waterproof breathable garments in occupational and consumer markets.
Subtopics
- Evaporative Resistance Ret Measurement ISO 11092 Evaporative resistance measurement on the sweating guarded hotplate uses the same instrument as ther…
- Moisture Vapour Transmission Rate Testing ASTM E96 Moisture vapour transmission rate testing measures the mass of water vapour passing through a fabric…