Some Physico-Chemical Properties of Carbon Blacks
Abstract A study was made of the adsorption of carbon tetrachloride vapor by various types of blacks, and data were obtained on the heats of wetting of blacks by carbon tetrachloride. A study was made of the fat coefficients and the points of spontaneous combustion of various types of blacks. It was found that active blacks can be distinguished from inactive blacks by their powers of adsorption of carbon tetrachloride and also by their heats of wetting. There is no way of telling by its fat coefficient whether a black is of value in rubber. The point of spontaneous combustion gives an approximate idea of the origin and formation of a black. Data on electrical conductivity have thus far not provided any basis for classifying different types of blacks.