The viscosity of molten Pd82Si18was measured from 1045 to 1210 K by capillary flow method. When the molten specimen was not purified in advance and during the experiment, its viscosity could not be determined for temperatures below the liquidus. On the other hand, in the presence of boron oxide flux, the viscosity could be measured up to an undercooling of 58 K below its liquidus and the entire viscosity can be described very well by the following Vogel–Fulcher equation: ln &eegr;=−3.779+(1102.135/T−684), whereTis in K. No discontinuity is found at the liquidus. The present data were compared with those of other glass forming systems to test the validity of the principle of corresponding states for atomic transport properties.