Table 1 Grading system for dispersion testing.
Grading system for dispersion testing | ||
|---|---|---|
Grade | Dispersibility and appearance | Time of self-emulsification (in min) |
MEa | The formulation easily spreads in water to generate a microemulsion that is transparent and clear. | < 1 |
MEb | Formulation may form microemulsion but first developed a transparent, gel-like intermediate structure before dispersing fully. | 3–5 |
E | Formulation droplets spread in water to form a fine milky emulsion | > 5 |
NE | Oil droplets coalesce in the formulation, indicating inadequate emulsification. | NA |
