Some group numbers are given in Table 7.3.

Choice of emulsifier or emulsifier mixture

The appropriate choice of emulsifier or emulsifier mixture can be made by preparing a series of emulsions with a range of surfactants of varying HLB. It is assumed that the HLB of a mixture of two surfactants containing fraction f of A and (l - f) of B is the algebraic mean of the two HLB numbers:

For reasons not explained by the HLB system, but from other approaches, mixtures

Table 7.3 Group contributions to HLB numbers


Group number

Hydrophilic groups

0 0

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