RPA Rubber Process Analyzer

The RPA flex, Rubber Process Analyzer, is the new standard in rotorless rotational shear curemeters. Besides the standard tests of cure at fixed frequency and strain, it is possible to configure the RPA flex in order to include variable strain, frequency, sample pressure measurement and advanced LAOS testing. The RPA flex is available with a wide range torque transducer and variable sealing pressure and pressure sensor.

Employing sealed biconical dies, the RPA flex meets all relevant ISO, DIN and ASTM standards for elastomer and rubber characterization. The unique design comprises of an ultra-rigid test frame precision temperature control with optional cooling, variable direct drive motor, available Autosampler, and powerful Scarabaeus Control and Analysis Software, making it the perfect platform for R&D and QC environments.


  • User calibration and user replaceable seals
  • Extremely rigid test frame for accurate compliance free data
  • Upgradeable to the widest range of testing conditions and tests
  • Fully programmable variable testing parameters (strain, frequency, closing pressure and temperature)
  • Available autosampler for unattended operation
  • Pneumatic locking cylinders with adjustable platen closing force and pressure sensor
  • High resolution variable direct drive motor for absolute strain control
  • Proprietary high stiffness, wide torque range transducer with high sensitivity for noise free data


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Frequency 0.1 to 2.0 Hz (6 to 120 cpm)
Optional: 0.001 to 50 Hz (0.06 to 3,000 cpm)
Amplitude Standard: ±0.1 to ±7° arc (continuous)
Optional: ± 0.005 to 360° arc (continuous)
Strain Standard: ±1.47 % to ±100 %
Optional: ±0.07 % to ±5000%
Torque 0.0001 to 25 Nm
Temperature Ambient to 230 °C
Maximum Ramp Rate 80 °C/min (1.33 °C/s)
Die Type Sealed bicone, 0.48 mm gap
Sample Volume 4.5 cm3
Platen Sealing Pressure Fixed: 4.5 bar
Optional: 2 to 8 bar adjustable
Sample Pressure Optional: 0 to 8,500 kPa
Test Modes Standard Method
Curemeter/Vulcanization both isothermal and temperature ramp
Optional Methods
Strain (sweep, offset, LAOS)
Frequency Sweep
Stress Relaxation
Advanced (multi-frequency, abitrary waveforms)
Measured Data Torque, Temperature, Frequency, Amplitude, Sample Pressure (optional)
Calculated Data Standard: More than 550 process parameters including: ts1, TC10, TC50, TC90, S’min, S’max, scorch time, cure rate and viscoelastic properties including: G’, G”, G*, S’, S”, S*, tan δ, η’, η”, η*
Optional: LAOS Lissajous curves, non-linearities in stress and strain
Standards Standard: ASTM D5289, ISO 6502, DIN 53529
Optional: ASTM D6048, D6204, D6601, D7050, D8059; ISO 13145

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