EN 367 & ISO 9151 Convective Heat Resistance Test Apparatus for Protective Clothing Fabric

I. ISO 9151 EN367 Heat Transfer Index Test Apparatus A new term heat transfer index (HTI) has been introduced to avoid confusion with the thermal protective index (TPI) or other terms used in previous versions of this test. HTI calculated from the mean time in seconds to achieve a temperature rise of 24±0.2ºC when testing by this method using a copper disc and a starting temperature of 25±5ºC. The heat transfer index provides a method of grading materials which does not imply