This European Standard specifies a method for the determination of the solubility of ionic surface active agents in
water as a function of concentration and temperature and for the determination of the Krafft point by graphical
evaluation of the measurement results.
In the temperature range from 0 °C to 90 °C, the solubility is determined without any limitations if the viscosity of
the solution does not exceed about 700 mPas.
At temperatures below 0 °C, determination is only possible if the solvent does not freeze.
The method is applicable both to pure surface active agents and to technical products optically clear and not
unduly coloured solutions.
The solubility both of solid and liquid surface active agents and of aqueous solutions of surface active agents is
determined by the method specified.
BS EN 13955:2002 history
2002BS EN 13955:2002 Surface active agents - Determination of Krafft point and solubility of ionic surface active agents