At one time, the Mooney Viscometer was the most common tool used to determine the processing characteristics for a given batch of rubber. Many compounders still use the Mooney to verify viscosity (which is indicative of molecular weight) when obtaining raw polymer stock. This works because a sample’s resistance to being moved by the Mooney’s internal rotor is directly linked to its viscosity. The viscometer is also helpful in determining scorch time, or how long a material can be exposed to heat before it starts to cure. The viscometer’s role as the chief indicator of processing traits, however, was usurped by the rheometer.

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