Test method

The samples are placed onto an electrically heatable porous plate (thermoregulation model of the human skin). The plate is placed in a climatic chamber and a fan blows air with defined temperature, humidity, and velocity tangentially onto the sample's surface. To avoid heat loss, the measuring surface is surrounded by a guard heated up at the same temperature as the plate. The measuring surface is covered by a foil permeable to water vapor but impermeable to liquid water. Water is supplied to the plate to allow a water vapor flow from the surface.

The water-vapor resistance is determined using the following parameters:

• The power required to maintain the measurement plate at a constant temperature throughout steady state (as a measure of the amount of vaporized water),
• The vapor pressure difference between the atmosphere and the plate, and
• The size of the plate

Test method

The samples are placed onto an electrically heatable porous plate (thermoregulation model of the human skin). The plate is placed in a climatic chamber and a fan blows air with defined temperature, humidity, and velocity tangentially onto the sample's surface. To avoid heat loss, the measuring surface is surrounded by a guard heated up at the same temperature as the plate.

The thermal resistance is determined using the following parameters:

• the power required to maintain the measurement plate at a constant temperature throughout steady state,
• the temperature difference between the atmosphere (20°C) and the plate (35°C),
• the size of the plate

The hot plate has a size of 40 x 40 cm.

If you have any queries regarding the suitability, cost or time frames associated with this testing, please do not hesitate to contact us.

DIN EN ISO 11092:2014 Textiles –Physiological effects –Measurement of thermal and water-vapour resistance under steady-state conditions