In the RPA Ultra, a strong direct drive motor applies precise deformation. The accurate application of a constant rate, step, or periodic deformation is essential for a high-quality rheological or dynamic measurement. Start-up lags, compliance issues, and translational losses present in clutch- or belt-driven designs are not present in direct drive systems. The RPA elite’s improved motor design makes sure that the sample is always subjected to the most precise and repeatable deformations.

In any rubber rheometer, the RPA Ultra uses the highest ratio of continuously changeable frequency and amplitude. This gives crucial, pertinent information like:

• High-filled rubbers’ linear viscoelastic response to low strain
• High-strain behaviour under harsh processing and use circumstances
• Behaviour of terminal materials at low frequencies
• Response to high-frequency measurements of high-speed deformations

The RPA Ultra die surfaces have radial serrations that are strategically placed to ensure constant sample contact even at the highest strain levels. To improve sample release and eliminate the need to clean dies between experiments, polyester or polyamide films may be utilized.

NextGen’s RPA Ultra – Advanced Rubber Process Analyzer sample volume is 4.5 cm^2.

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