The effect of the temperature on the conductivity of ternary systems of sodium bis(2-ethylhexyl)-sulfosuccinate + 2,2,4-trimethylpentane + water has been studied. The effect of the presence of organic additives-urea, methylurea, 1,3-dimethylurea, 1,1-dimethylurea, tetramethylurea, thiourea, methylthiourea, 1,3-dimethylthiourea, and tetramethylthiourea-on the variation of the conductivity with the temperature in these ternary systems has also been studied.