382 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS ABSORPTION .... ß • •'•. , ABSORPTION 311 nm. ! 1 .,_•----•_ 0.8 0.6 - 0,4- 0.2 - + • 3S9 rim. 0 15 30 45 60 75 TIME (days) 0.6 0.4 0,2 o 9O ß 25"C 311nm I 40•C 311nm • 60"C 311nm ß 25"C 359nm I 40•C 359nm ' • 60"C 359nm Figure 3. Absorbance of the formulation as a function of time for three temperatures and two wavelengths. pH PH • _ _ _ o 20 35 50 65 80 TIME (days) -õ -6 -4 -2 • 0 ß 2fi.C I 40oc * 60.C Figure 4. Effect of time on the pH of the formulation for three temperatures.
SILICONE-BASED SUNSCREENS 3 _• 60 RPM RPI• 40- 20- 0 200 270 340 410 480 550 620 690 Dines x cm-2 60 -40 -2O -----25•C .I 40•C :t 60•C Figure 5. Rheograms of the formulation at room temperature, 10øC, and 60øC. Figure 6. Optical micrograph of the formulation at room temperature.
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