Formula 2. SPF 30 sun lotion

A.
PEG-30 Dipolyhydroxystearate (Cithrol DPHS, Croda), 2.50% w/w
C12-15 Alkyl Benzoate (Crodamol AB, Croda), 13.00
Isohexadecane (Arlamol HD, Croda), 3.00
PPG-15 Stearyl Ether (Arlamol PS15E, Croda), 1.00
Cyclopentasiloxane (Dow Corning 245 Fluid, Dow Corning), 2.00

B.
Titanium Dioxide (and) C12-15 Alkyl Benzoate (and) Polyhydroxystearic Acid (and) Stearic Acid (and) Alumina (Solaveil XT-100, Croda), 18.00

C.
Water (aqua), qs
Magnesium Sulfate Heptahydrate, 0.80
Glycerin, 4.50

D. Preservative, qs

Procedure: Combine A and heat to 85°C. Separately combine C and heat to 85°C. Add B to A with stirring and maintain temperature. Add C to AB slowly with intensive stirring. Homogenize for 1 min. Stir and cool to RT, adding D to batch below 40°C. Appearance = white lotion; viscosity = 9,540 mPas (Brookfield RVDV1, spindle 3, 5 rpm, 1 min); in vivo SPF = 31; UVA/UVB ratio = 0.79; label SPF = 30; in vitro UVAPF = 10; ratio label SPF/UVAPF = 3.0.