This oil-in-water sunscreen lotion provides high UV protection. The combination of SolaStay® S1, Polycrylene® and HallBrite® BHB ensures reliable photostability for Avobenzone. In vitro testing suggests SPF ~76, PFA (PPD) ~23 performance with critical wavelength = 377 nm. In vivo testing in a US laboratory (5 subjects) yielded static SPF 85, with 80-minute water resistant SPF 80.
| Sequence | Trade Name | INCI Name | % | |
| A |
|
up to 100 | ||
|
3.0 | |||
|
.25 | |||
| B |
|
0.05 | ||
|
1.20 | |||
| C |
|
10.0 | ||
|
5.0 | |||
|
15.0 | |||
| HALLBRITE® BHB* | Butyloctyl Salicylate | 5.0 | ||
|
Ethylhexyl Methoxycrylene | 3.0 | ||
| Polyester-8 | 4.0 | |||
| D |
|
3.0 | ||
| E |
|
2.0 | ||
|
0.40 | |||
| F |
|
3.0 | ||
| G |
|
0.50 | ||
|
a.n. |
PREPARATIVE PROCEDURE
1 To the main vessel add liquids of phase A, start mixing and disperse Pemulen TR-2 with strong mixing for 20-30 minutes.
2 Heat dispersion with gentle mixing to 70-75 °C, add phase B in phase A and mix until dissolved.
3 To a secondary vessel add phase C, start mixing and add phase D. Heat to 70 – 75°C and then add phase E with mixing.
Add phase F before combination and mix until uniform.
4 When both phases are homogeneous and at their designated temperatures, add phase CDEF to phase AB.
5 Strong mix ABCD for 3 minutes and then cool batch.
6 When batch is below 50°C add phase G with mixing, replace any water lost and mix until smooth.
