Evans, N.J. JACoW Publishing Geneva, Switzerland The SNS uses charge exchange injection during the accumulation of the accelerated beam in the ring. At a beam power of 1.2 MW, the stripping foil lasts for many weeks, sometimes months. However, given the upgrade to 2.8 MW, it is important to know the current temperature of the foil in order to estimate its lifetime for the new beam power and beam size. This paper will discuss the foil R&D and experimental temperature measurements of a stripper foil, exposed to current operating conditions of the SNS accelerator.