Abstract
Abstract Webster defines plasticity as “the ability to retain a shape attained by pressure deformation”. Plasticity measurements are made by rubber technologists for one or more of the following reasons: (1) to measure the workability of rubber or synthetic elastomers; (2) to determine the effect of natural or accelerated aging on the processability of compounded rubber or synthetic elastomers; (3) to determine to what extent softeners or compounding ingredients may have affected the workability of rubber or synthetic elastomers; (4) to serve as a control test in the manufacture of synthetic elastomers. The Williams Plastometer has been widely used in the rubber industry for a number of years. Since its introduction in 1924 by Williams it has undergone a number of refinements which have improved its mechanical efficiency and simplified its operation. However, the fundamental operating principles of this machine have been retained. This article discusses the modifications that have been incorporated into the instrument now in use at the du Pont rubber laboratories.
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