The results of experiments that measure the spectral emittance &egr;&lgr;(hence absorptance) at 3.8‐&mgr; wavelength for 6061 aluminum alloy and 9606 pyroceram at elevated temperatures are reported. &egr;&lgr;for 6061 aluminum was measured within the molten state over the surface temperature range of 1200–2100 °F. For 9606 pyroceram, &egr;&lgr;was measured between 1000 and 2000 °F. The data shows that for aluminum, &egr;&lgr;increases linearly with temperature from 0.138 at 1200 °F to 0.190 at 2100 °F. For pyroceram, &egr;&lgr;has an initial value of 0.91 at 1000 °F and slowly decreases to 0.68 at 2000 °F.