f ^HE reénforcing proper-I ties of pigments used in rubber compounding and the milling characteristics of these pigments are so intimately connected with their degree of fineness that considerable interest is attached to securing measurements of their average par-157
While a few methods for solubility determination in rubber have been available, they are somewhat difficult and susceptible to large errors. A new method has been developed which has the advantage of being simple, rapid, and accurate, and applicable to all solids soluble in rubber. The apparatus developed can be used for any problem where microscopic observation at elevated temperature will yield information. The results thus far obtained are of use in explaining the peculiarities of certain organic compounds when used with rubber. It is hoped that sufficient data may be obtained to establish accurately the solubility properties of entire classes of compounds as well as mixtures of several components. In addition to molecular weight determination, the method may yield further results of theoretical interest.
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