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The hydrophilic-lipophilic balance of a surfactant is a measure of the degree to which it is hydrophilic or lipophilic, determined by calculating values for the different regions of the molecule, as described by Griffin in 1949 and 1954. Other methods have been suggested, notably in 1957 by Davies. ==Griffin's method== Griffin's method for non-ionic surfactants as described in 1954 works as follows: where is the molecular mass of the hydrophilic portion of the molecule, and M is the molecular mass of the whole molecule, giving a result on a scale of 0 to 20. An HLB value of 0 corresponds to a completely lipophilic/hydrophobic molecule, and a value of 20 corresponds to a completely hydrophilic/lipophobic molecule. The HLB value can be used to predict the surfactant properties of a molecule: * < 10 : Lipid-soluble (water-insoluble) * > 10 : Water-soluble (lipid-insoluble) * 1.5 to 3: anti-foaming agent〔 * 3 to 6: W/O (water in oil) emulsifier * 7 to 9: wetting and spreading agent〔 * 13 to 15: detergent〔 * 12 to 16: O/W (oil in water) emulsifier * 15 to 18: solubiliser or hydrotrope〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrophilic-lipophilic balance」の詳細全文を読む スポンサード リンク
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