The cloud point of a nonionic surfactant or glycol solution is the temperature at which the mixture starts to phase-separate, and two phases appear, thus becoming cloudy. This behavior is characteristic of non-ionic surfactants containing polyoxyethylene chains, which exhibit reverse solubility versus temperature behavior in water and therefore "cloud out" at some point as the temperature is raised.
Sr No. | Test | Standard Specifications | Results |
---|---|---|---|
1 | Physical State | The Material shall be in the form of liquid at 24+/- 2 C, free from visible impurities | Complies |
2 | Appearance | Pale yellow to brownish | Complies |
3 | pH of 3% (v/v) sample in 10% (w/v) KCl Solutions in Distilled Water | 6.0 – 8.0 | 7 |
4 | Cloud Point of 5% (v/v) sample in 10% (w/v) KCl in distilled water, C | 60 -85 | 68 |
5 | Pour Point | -6 C Min | -7 C |
6 | Surface Tension (at 25 C) | 40+/- 10 | 39 |
7 | Solubility in water | Miscible | Miscible |