The emittance (ε) was obtained according to regulation ASTM E1933-99a, 2006 through a temperature sensor with a type T thermocouple associated to a data logger hobbo U12.
The value of the radiant flux emitted by the material was compared to the data registered in an IR Fluke 568 thermometer with emittance adjustment. This way the emittance of the material corresponds with that which makes the temperature of the thermocouple coincide with that of the IR thermometer.