The most efficient rotorless oscillating shear rheometer for the comprehensive characterization of polymers, rubber, and rubber compounds at all stages of manufacturing is the BrassOne RPA Ultra rubber process analyzer (RPA). The RPA Ultra offers priceless viscoelastic information on raw materials, materials that have undergone curing, and materials that have been cured in place. The most precise and accurate torque, viscosity, and viscoelastic properties of elastomers are delivered by the ultra-rigid test frame, high-resolution variable direct drive motor, ultra-stiff wide-range torque transducer, and precision temperature control over the broadest ranges of testing conditions.

The nonlinear viscoelastic behaviour of a sample is investigated and evaluated using the LAOS strain sweep at reasonably large amplitudes. A substance’s nonlinear behaviour depends on whether it has a linear or branched polymer structure. The LAOS data are also used for FT- Rheology. The Q parameter, also known as the LCB index (Long Chain Branching), is derived using the harmonic spectrum from Fourier analysis (FFT).

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