A Simplified Extrusion Plastometer for Unvulcanized Rubber

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Abstract
A new extrusion plastometer for unvulcanized rubber is described. In this plastometer, the rubber sample is cut automatically and the extrusion chamber is filled in a single operation. The time of extrusion, which is measured by an accurate elapsed time indicator, is chosen as an index of plasticity. The plastometer is shown to be rugged, simple, and rapid in operation. Data are presented which establish the sensitivity and accuracy of the instrument. The results of the extrusion plastometer are discussed with respect to their correlation with those of the Williams plastometer and the United States Rubber Company shearing disk plastometer.

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