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pH changes of polyethylene glycol (PEG) ointments at different temperatures.
| 4 °C | 25 °C | 40 °C | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Month(s) | 0 | 2 | 4 | 0 | 2 | 4 | 0 | 2 | 4 |
| pH (Ointment in ratio 2:1) (WPEG4000:WPEG 400) |
4.95 ± 0.05 | 4.97 ± 0.04 | 5.03 ± 0.10 | 4.95 ± 0.05 | 5.01 ± 0.02 | 4.98 ± 0.07 | 4.95 ± 0.05 | 4.43 ± 0.02 | 4.01 ± 0.03 |
| pH (Ointment in ratio 3:1) (WPEG4000:WPEG 400) |
5.01 ± 0.05 | 5.07 ± 0.04 | 5.20 ± 0.10 | 5.08 ± 0.05 | 5.04 ± 0.02 | 4.95 ± 0.06 | 5.10 ± 0.05 | 4.61 ± 0.03 | 4.28 ± 0.04 |
