The sealed cavity biconical die design, which is the industry standard, is used in the RPA Ultra rotorless shear rheometer. The dies are made of sturdy, highly rigid, low thermal expansion stainless steel to reduce system compliance and stop temperature-related gap variations. The motor below and the torque transducer above are directly connected to the test fixtures for accurate measurement and deformation control.

Under isothermal, step, and temperature ramp circumstances, direct-contact electric heaters positioned inside the dies offer exceptional temperature control and stability. When a cold sample is added, this extremely responsive device quickly returns to the programmed test temperature, giving the most accurate readings for scorch time and other cure properties. Absolute sample containment is provided by extremely robust user-replaceable seals in all temperatures and environmental factors.

NextGen’s RPA Ultra – Advanced Rubber Process Analyzer Die Gap is 0.45 mm nominal.

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