Cosmetics Formulation Development

Hello, I would like to ask if you use SPF ULTRA II 15% with DHHB 5% will get a rough SPF from the calculation at 50PA+++ or do I have to mix it with สารกันแดด Which one gets PA+++?

Hello, adding DHHB in the formula must be Solvent DHHB along with the solvent. together Otherwise it will not be effective (because it is completely insoluble) using DHHB where 5% is very high and can often make formulas sticky (or yellowish) so may be considered. DHHB in conjunction with Zinc Oxide partially, you can know the SPF value clearly, you need to send it for testing. The company has a lab service to measure SPF for you. If interested, please contact customer relations.