Abstract
After a short review of the different physical methods of determination of the HLB (lipophilic/hydrophilic balance) value of surface-active agents, two techniques were investigated and experiments were performed on a large number of commercial surface-active agents: H-NMR which computes HLB with the help of the integration of the H-signals from the lipophilic and hydrophilic parts of the molecule and by dielectric constant measurement which computes the HLB from knowledge of the polarity of molecules under the influence of an electrical field. The results are described and discussed.
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