The well-known Mooney viscometer is typically used to test and certify the rheological properties of pure gum rubber in accordance with ISO 289. This test is often performed to determine which polymer to employ for a particular recipe. Most rubber technologists know that this method falls short in providing information on compound flow behaviour, particularly when comparing polymers with equal ML(1+4) from different suppliers. Despite the fact that more polymer suppliers are now offering this attribute, Money Stress Relaxation has enhanced polymer source discrimination but is not yet commonly used by polymer users.

Descriptive testing of gum rubber is now simple and reproducible thanks to the development of closed cavity oscillatory rheometers, also known as Moving Die Rheometers, Dynamic Mechanical Analyzers, and Rubber Process Analyzers. These devices allow for the testing of the mechanical characteristics of polymeric materials as a function of frequency at various controlled temperatures.

NextGen’s RPA Ultra – Advanced Rubber Process Analyzer Oscillation frequency is 0.001 to 100 Hz.

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