While PMMA appear to be a first choice for UVA in vitro
testing [4], our experimental results suggest that for in vitro SPF
other substrates could provide better performances. In our study,
we have performed tests with a rate of application of 1 mg/cm2 and
no other amounts of product have been evaluated; we choose an
unique quantity of application in order to compare the absorbance
curves obtained with the different substrates.