SPF UVA/UVB measurement (Boots Star/PA equivalent)
In vitro spectrophotometric assay for UVB Sun Protection Factor (SPF per Cosmetics Europe INT-ISPF-2021-01) and UVA Protection Factor (PF per INT-UPF-2021-01 / ISO 24443), mapped to Boots Star rating and PA++++ grading for Thai อย. documentation.
Sample Requirement:
Type: Sunscreen formulation (lotion/cream/emulsion)
Amount: 10 grams
