Testing plate made of optical quartz has been developed for the purpose of determination of sun protection factor (SPF) in vitro by the method of diffusion transmission spectroscopy;the plates were coarsened by sanding and grinding to surface roughness values (Ra) of 18 ml.
The plate was coated with a film of sunscreen by an application of 2 mg/cm as that used for determination of SPF in vivo the SPF in vitro fit well with the values determined means of the COLIPA method in vivo.