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Pressed polytetrafluoroethylene (PTFE) powder is commonly used as a reflectance standard for bidirectional and hemispherical geometries. The wavelength dependence of the reflectance factor of PTFE is presented for the near-infrared spectral region (800 nm to 1600 nm) for the 45Њ/0Њ geometry, as well as in the visible spectral region (380 nm to 800 nm) for comparison with previously published results.doi:10.6028/jres.104.013 fatcat:vaxrr2s6frh75jigpdkui3j5xi