Hot plate

Water vapour resistance Ret according to EN ISO 11092

Test procedure

The samples (26 x 26 cm) are placed onto an electrically heated 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 surface of the sample. In order to avoid heat loss, the measuring plate is surrounded (underneath and on the sides) by a guard which is heated to the same temperature as the plate (35°C). The measuring surface is covered by a foil permeable to water vapour but impermeable to liquid water. Water is supplied to the plate to allow a water vapour flow from the surface. The water vapour resistance is assessed using the heating power supplied to the surface under steady-state conditions (as a measure of the amount of vaporised water), the pressure difference between the atmosphere and the plate, and the size of the plate.

Thermal resistance Rct according to EN ISO 11092

Test procedure

The samples (29 x 29 cm) are placed onto an electrically heated 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 surface of the sample. In order to to avoid heat loss, the measuring plate is surrounded (underneath and on the sides) by a guard which is heated to the same temperature as the plate. Using the heating power supplied to the plate under steady state conditions, the temperature difference between the atmosphere (20°C) and the plate (35°C), and the size of the plate, the thermal resistance is calculated.

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Hot plate

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

 

Relevant standard

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