SPF Testing for Multi-Shade Products: Sample Submission Requirements
Question
For the SPF UVA, UVB measurement service (Boots Star/PA eq.), if I have cosmetic samples that have different shades but utilize the exact same base formula (including all UV filters and concentrations), do I need to submit all shades for testing, or is submitting just one representative shade sufficient for product registration purposes?
Answer
For SPF, UVA, and Boots Star/PA equivalent testing, if the base formula (including all UV filters and their concentrations) is identical across different shades, you generally only need to submit one representative sample for testing.
The standard industry practice is to test the lightest shade or the unpigmented base product. This is because:
- Worst-Case Scenario: Pigments (colorants) can sometimes contribute slightly to UV protection. By testing the lightest shade (which has the least amount of pigment), you are testing the "worst-case scenario" for the formula's performance.
- Compliance: If the lightest shade passes the required SPF value, all darker shades with the same base formula are considered compliant and can use the same test report for registration.
Recommendation: Submit the lightest shade of your product. Always confirm this procedure with the specific regulatory body (e.g., FDA, ASEAN) for your product registration, but this is the accepted standard for efficacy testing.