This mathematical relationship is no longer applicable for polymers with unknown LCB (Long Chain Branching) levels. In the case of polymer discrimination or quality control, however, computing and reporting the crossover point coordinates for these materials is exceedingly efficient and sensitive—at least much more so than Mooney. In this situation, it’s feasible that no crossover point can be seen for either extremely high LCB levels or extremely low viscosities. In this situation, the test temperature must be modified. According to the Time-Temperature Superposition principle, the test temperature should be increased if the crossover point appears to be toward higher frequency and dropped if it appears to be toward lower frequency.

Beyond the capabilities of any other rubber rheometer, the RPA Ultra’s fully flexible architecture enables advanced testing capabilities, such as complete post-cure viscoelastic characterization, fully programmable sealing pressure, large amplitude oscillatory shear (LAOS), and arbitrary waveform deformations.

NextGen’s RPA Ultra – Advanced Rubber Process Analyzer Oscillation Strain is

+/- 0.001° to unlimited,

‚+/- 0.014% to unlimited

-> rotational

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