This biphasic sunscreen does not use an emulsifier and yet is stable. The combination of Hallstar® Octyl Isononanoate, SolaStay® S1, and HallBrite® BHB helps optimize polarity, viscosity, and density to form two phases. In vivo testing in a US laboratory (5 subjects) yielded static SPF 37. We used Colipa Guidelines (2011) in our testing which delivered SPF ~34 and PFA (PPD) ~11 performance. Critical wavelength = 375 nm. UVA1/UVA – 0.80. Importantly, the formulation contains neither oxybenzone nor octinoxate, which means it complies with the 2018 Hawaii sunscreen bill that goes into effect in 2021.
Note: our Biphasic Sunscreen Spray SPF 30 requires a good shaking before use.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Octocrylene [Octocrilene] | 8.00 | UV Filter / Sunscreen Agent | |
| Homosalate [Homosalate] | 10.00 | UV Filter / Sunscreen Agent | ||
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
Butyloctyl Salicylate | HallBrite® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
Ethylhexyl Methoxycrylene | SolaStay® S1* | 0.75 | Photostabilizer | |
Ethylhexyl Isononanoate | HallStar® Octyl Isononanoate | 20.00 | Emollient | |
| Colorant(s) | a.n. | Colorant | ||
| B | Butyl Methoxydibenzoylmethane [Avobenzone] | 3.00 | UV Filter / Sunscreen Agent | |
| Poly C10-30 Alkyl Acrylate | 0.25 | Structuring agent | ||
| C | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Phenoxyethanol, Caprylyl Glycol, Chlorphenesin | 0.60 | Preservative | ||
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Sodium Chloride | 0.10 | Stabilizing Agent |
PREPARATIVE PROCEDURE
| 1 | To a secondary vessel, phase A and start mixing. Heat it to 60 - 70°C. |
| 2 | Add phase B into phase A and mix until uniform, and then start cooling. |
| 3 | To the main vessel add the liquids of phase C, start mixing; and then add the solid, and mix until uniform. |
| 4 | Slowly add phase AB to phase C under gentle stirring. |
PRODUCT CHARACTERISTICS (25°C)
| Appearance | Two phases thin liquid |
*Patented and Patent Pending
The information presented herein is believed to be accurate and reliable, but no warranty or guarantee, expressed or implied, is made regarding the information or the performance of any product. Further, nothing contained herein shall be taken as any inducement or recommendation to use, manufacture or sell that may infringe any patents or any other proprietary rights now or hereafter in existence, nor to imply compliance with any regulatory requirements
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