Table 2. Surface tension vs. time for silicone polyethers at different pH levels

 Sample Day 1  Day 2 Day 3  Day 4  Day 5  Day 7  Day 14  Day 21  Day 28 
PEG-8 Diemthicone 21.9 21.8 22.0 21.8  21.8  21.9   21.7 21.9 21.8
PEG-8 Dimethicone (pH 10) 22.1 21.9 22.1 22.0 21.9 22.0 21.7 21.6 22.6
PEG-8 Dimethicone(pH 4)  22.1 21.7 22.1 22.3 21.8 22.5 22.2 22.6 22.3