174 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 6l . -- NO ADDED ELECTROLYTE --©-- 0.001 g/lOOml. Na Cl 59 . --•-- 0.01 g/lOOml. Na CI --o-- 0.1 g/lOOml. Na CI •õ71 ' --o-- 1.0 g/lOOml. Na CI x-- I0.0 g/lOOml. Na CI 55- 51 © 47 45- 43- SURFACE TENSION vs. CONCENTRATION 41- El5 PRODUCT 39- 37 I I I I O.000l 0.001 0.0• O. • 1,0 •O.g CONCENTRATION OF ETHOXYLATE (g/lOOml) Figure 5. Variation of surface tension as a function of concentration of El5 ethoxylate it] the presence of sodium chloride 61- -- NO ADDED ELECTROLYTE --©-- 0.001 g/lOOml. Ca CI 2 • 59 - --•-- 0.01 g/lOOml. Ca CI2 3 • O. I g / IOOml. Ca CI• FO 57 _ • --o-- 1.0 g/lOOml. Ca CI• •. •x• I0.0 g/IOOml. Ca CI• • 47 - • 45 - • 43 - D SURFACE TENSION vs. CONCENTRATION • El5 PRODUCT 41 - 39 - 37J I I I 0.000• O.Om O.m O. • •.0 •0.0 CONCENTRATION OF ETHOXYLATE (g/{OOm}) Figure G. Variation of surface tension as a function of concentration of ethoxylate in the presence of calcium chloride

ELECTROLYTES AND EMULSION STABILITY 61- --NO ADDED ELECTROLYTE --©-- 0.001 g/lOOml. K CI 59 - --•-- 0.01 g/lOOml. K CI • O. I g/IOOml K CI _ • o-- 1.0 g/lOOml K CI 57 • • I0.0 g/lOOml. K CI 45 43- SURFACE TENSION vs. CONCENTRATION 41' El5 PRODUCT 37 I I I I 'o.o•1 o,ool O,Ol o. I I.O IO,C CONCENTRATION OF ETHOXYLATE (g/lOOml) 175 Figure 7, Variation of surface tension as a function of concentration of ethoxylate in the presence of potassium chloride 591 •,• - -- NO ADDED ELECTROLYTE '•'•"%x. --©-- 0.001 g/lOOml. NoCI 57 •....% -• --8-- 0.01 g/lOOml NoCI i • '•..,.• • --.--0.1 g/lOOml. NoCI , • • • --,-- I00 g/IOOml NoCI • 49 •47 I m SURFACE TENSION 0 '• . VS. • 4• • CONCENTRATION • ß • 39 E I0 PRODUCT 37 0.0•1 0.001 0,01 O. I 1.0 I0,0 CONCENTRATION OF ETHOXYLATE (g/lOOml) Figure 8. Variation of surface tension as a function of concentration of El0 ethoxylate in the presence of sodium chloride