- Teflon (PTFE) has been extensively used [18] for UV application
due to its good transmittance and its Lambertian properties.
Samples of 7 cm2 area have been prepared in our laboratory from
a standard sheet (0.8 mm thickness) previously treated with a
blast sanding process in order to get a roughened surface. The use
of PTFE as a substrates for sunscreen evaluation test has been
recently proposed by our group