The extraction of rubber samples with acetone as an analytical procedure is a classical method; its origin is almost lost in antiquity, at least from the viewpoint of the rubber technologist. It is a valuable procedure, not only for practical evaluation of rubber samples, but from theoretical considerations as well. Acetone is commonly regarded as a polar “nonsolvent” for rubber, although some slight swelling action on rubber samples has been reported. Various investigators have carried out the extraction under differing conditions, and the results have been shown to vary somewhat with the treatment of the sample. The procedure as commonly employed today is well standardized, and great reliance is placed by rubber chemists on the analytical data obtained. The standard procedure, however, suffers from one serious drawback—the length of time necessary to obtain the desired data. With a large number of samples this factor is enormously magnified. When applied to plant control determinations, the disadvantage is too readily apparent. One possible method of reducing this difficulty would be the substitution for acetone of some other solvent, perhaps of higher boiling point, which at the temperature of extraction would have a greater solvent action on the non-rubber components. It should therefore accomplish the desired extraction in a shorter time.

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