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Calculated hydrophilic-lipophilic balance (HLB) values of the nonionic surfactants in the single and binary surfactant systems.
| Surfactant/mixed surfactant | HLB number |
|---|---|
| Tween 80 | 15.00 |
| Span 80 | 4.30 |
| Tween 80 : Span 80 (9 : 1) | 13.93 |
| Tween 80 : Span 80 (8 : 2) | 12.86 |
| Tween 80 : Span 80 (7 : 3) | 11.79 |
