![]() A comparison of results using grooved dies (no-slip) and polished dies (slip) readily provides wall slip velocity under constant pressure. The closed-boundary configuration prevents edge fracture, as commonly experienced with open-boundary rheometers (DMA) on high-viscosity, high-elasticity materials. The results fit well with other rheometers or viscometers when no-slip conditions are ensured. Using this type of test, the instrument has successfully measured steady shear viscosity with high repeatability without correction. Only recently and not for all models has a controlled steady shear test been made available. Later, it offered a controlled strain–stress relaxation test. In its initial version, the RPA was able to perform only oscillatory-type tests, which varied in frequency and strain. The rubber process analyzer was commercialized by Monsanto Rubber Instrument and Equipment company in the early 1990s.
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