Draves test wetting times

TABLE 13 Wetting Properties of Sulfosuccinate Diesters According to the Draves Test (g/L to give 25-s wetting time)... 

In 50 g/1 solid caustic yields a product that has very good detergency, low foam, and a wetting time (via Draves Cotton Skew Test) of agent 10-13 seconds. 

A fair correlation has been found (Smith, 2000) between diffusion coefficients and wetting times for cotton twill tape (using a modified Draves wetting test (Chapter 6, Section IIC). 

A fairly good correlation has been observed between the wetting time on cotton skeins, measured by the Draves test, and the dynamic surface tension (Chapter 5, Section IV) at 1 s. To achieve a 1-s dynamic surface tension value, yls, that does not change much with decrease in surfactant concentration, a bulk phase surfactant concentration of at least 5 x 10-4 M is required (Rosen, 1990). 

Wetting times for some surfactants, using the Draves test at 25°C, with a 3-g hook and a 5-g cotton skein, are listed in Table 6-1. 

TABLE 6-1 Wetting Times of Surfactants in Aqueous Solution (Draves Test, 2... 

TABLE 6-2 Wetting Efficiencies of Surfactants in Aqueous Solution (Concentrations for 25 s Sinking Time at 25° C in Draves Test)... 

Draves Wetting Test. A method for comparing the wetting power of surfactants in which one measures the time required for complete wetting of a sample of material placed at the surface of a surfactant solution, under specified test conditions. Different systems are compared in terms of their wetting times. See also Wetting. 

The Draves Wetting Time for a 0.1% solution of Na LED3A at pH 7 on cotton, nylon, and worsted wool is presented in Figure 12. The surfactant is qnite efficient at wetting nylon and wool, but not cotton, under the conditions of the test. Mixtures of Na LED3A with lauryl dimethyl amine oxide and sodium lauroyl sarcosinate are more efficient at wetting cotton than the pnre snrfactant (Fig. 13). 

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