  Polytetrafluoroethylene (PTFE), also known as Teflon, is a common material
used in the construction of liquid xenon detectors due to its high reflectivity
for the VUV scintillation light of xenon. We present transmission measurements
of PTFE for xenon scintillation light with peak emission at a wavelength of 175
nm. PTFE discs of different thicknesses are installed in front of a photosensor
in two setups. One is filled with gaseous xenon, the other with liquid xenon.
The measurements performed with the gaseous xenon setup at room temperature
yield a transmission coefficient of $\lambda =
\bigl(350{{}^{+60}_{~-0}}{}\,{\mathrm{(sys)}}\,\pm\,
50\,{\mathrm{(stat)}}\bigr)\,\mathrm{\mu m}$. This is found to be in agreement
with the observations made using the liquid xenon setup.
