03415 IUPAC Gold Book - Krafft point 10.1351/goldbook.K03415 K03415 current 1 The temperature (more precisely, narrow temperature range) above which the solubility of a surfactant rises sharply. At this temperature the solubility of the surfactant becomes equal to the critical micelle concentration. It is best determined by locating the abrupt change in slope of a graph of the logarithm of the solubility against \(t\) or \(\frac{1}{T}\). critical micelle concentration https://goldbook.iupac.org/terms/view/C01395 solubility https://goldbook.iupac.org/terms/view/S05740 surfactant https://goldbook.iupac.org/terms/view/S06194 PAC, 1972, 31, 577. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry' on page 613 (https://doi.org/10.1351/pac197231040577) https://goldbook.iupac.org/terms/view/K03415/html https://goldbook.iupac.org/terms/view/K03415/json https://goldbook.iupac.org/terms/view/K03415/plain Citation: 'Krafft point' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.K03415 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-09T23:25:47+00:00