SPF UVA, UVB measurement (Boots Star/PA equivalent)
In vitro UV spectrophotometric assay for SPF (290-320 nm weighted) and UVA-PF (320-400 nm) via ethanol dilution, sonication, filtration, and transmittance in quartz cuvettes.
Sample Requirement:
Type: semi-solid (sunscreen cream/lotion)
Amount: 2 grams