M259B

SWEATING GUARDED HOTPLATE

Sweating Guarded Hotplate. The physical properties of textile materials, which contribute to physiological comfort, involve a complex combination of heat and mass transfer. In today’s demanding world of leisure and comfort clothing it has become increasingly important to know the water vapor resistance and thermal resistance properties of fabrics and fabric assemblies.

The Sweating Guarded Hotplate (referred to as the skin model), simulates the heat and moisture transport processes which occur next to the human skin.

The standard unit conforms to ISO 11092 measurement of thermal and water vapor resistance under steady state conditions.  ASTM D1518 test method for thermal transmittance, NFPA 1971 protective ensemble for structural firefighting (total heat loss test), ASTM 1868 standard test method for thermal and evaporative resistance for clothing materials can also be accommodated and should be specified at the time of enquiry.

The unit is housed in an integral conditioned cabinet in which the parameters of air temperature, air speed and relative humidity are accurately monitored.  The incoming laboratory air should be controlled to standard textile testing conditions as specified in ISO 139,              EN 20139/20187, ASTM D1776 and other related standards, as 20 +/- 1^oC (70 +/- 2^oF) and 65% RH +/- 2.

Water is fed to a heated metal plate to produce water vapor. As a result of the humidity gradient between the plate surface and the cabinet environment, the vapor is transferred through the sample into the environment.

The equipment incorporates a user-friendly Windows based software package, which is used to interpret the standards and produce values for thermal resistance and water vapor resistance, and can be printed out on a standard test report.

M259B        Sweating Guarded Hotplate (Advise Standards Required)