Covering both the UVB and UVA spectral regions, the system automatically scans from 290 to 400 nm, accumulating and storing data at intervals of 1, 2 or 5nm. The monochromatic protection factor (MPF) is determined for each of the selected wavelengths and is used to calculate the SPF value, using solar irradiance and erythemal constants that are programmed into the software but which can be easily modified.

 

SPF-290S Sample Handling & Support Media Liquids, creams and gels are applied in small “dabs” or “spots” to the Transpore Tape® or other substrate, with the pipette supplied with the system. The substrate is placed on an open metal frame. The sample is spread lightly and evenly over a 55 cm2 area at 2 µl/cm2, equivalent to in-vivo testing. Sprays and sticks are applied directly to the substrate material, just as they would be in actual use. Quartz plates are available from Optometrics for sprays and difficult samples.   Running: Sample Presentation Video Transpore® is a registered trademark of The 3M Corporation