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Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely usedin light collection systems for particle physics experiments. However, thereflectance of PTFE is a function of its thickness. In this work, weinvestigate this dependence in air for light of wavelengths 260 nm and 450 nmusing two complementary methods. We find that PTFE reflectance for thicknessesfrom 5 mm to 10 mm ranges from 92.5% to 94.5% at 450 nm, and from 90.0% to92.0% at 260 nm. We also see that the reflectance of PTFE of a given thicknesscan vary by as much as 2.7% within the same piece of material. Finally, we showthat placing a specular reflector behind the PTFE can recover the loss ofreflectance in the visible without introducing a specular component in thereflectance.

Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air