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A new dynamic mechanical rheological tester called the RPA 2000 rubber process analyzer by Monsanto can analyze rubber masterbatches as well as rubber compounds before, during and after cure. It requires no special sample preparation, is easy to operate, and can apply a wide range of dynamic test conditions to a rubber sample, including very high strains. This paper discusses the use of this new instrument as a processability tester in predicting the effects of variations in filler and oil types and loadings on rubber compound behavior.

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