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