Constant shear viscosity is one of the most important characteristics for setting the process parameters for extrusion and injection moulding. It is crucial to comprehend how a rubber compound made without vulcanization is made. The revolving bottom die with infinite strain of the RPA Ultra gives the operator two test modes: dynamic and sustained shear.

In the investigation of the kinetics of rubber cross-linking, the ODR has proven to be a helpful instrument. It is simple to use to calculate cure times. Additionally, it can be used to develop vulcanizates by contrasting various cure package systems. The ODR should be configured to oscillate between 3 and 100 times per minute with a 3-degree arc.

The sample will become hotter if the arc is larger or the oscillation rate is higher. When this occurs, the curing profile is measured by the device at a temperature greater than that set, and the data are useless. According to some reports, 900 CPM can result in a temperature difference of up to 80 °C.

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