Rates of moisture absorption by the coatings of three types and three brands of modified 18-8 austenitic electrodes were determined at temperatures of 75, 85 and 100 F and relative humidities of approximately 50, 70, 82 and 96%. The rates of absorption varied with the different brands, the most pronounced variations taking place at the higher humidities. Temperature was found to be very effective in influencing the rate at which moisture is picked up by the coatings, but the total amount absorbed at equilibrium was found to be determined by relative humidity, at least for the range of temperatures used in this investigation.Some of the absorption data were plotted in logarithmic graphs and the empirical equation for the straight portion of the curves and the values of the constants were determined.