After the sample is picked up from the autosampler tray, it is moved to the test position using a suction transfer system. This system is highly tolerant of non-ideal sample geometries, so uncured rubber from many sources can be used. Samples are loaded on a carousel and more specimens may be added while another test is in progress, allowing for uninterrupted productivity.

TA Instruments rubber testing systems are manufactured to exacting mechanical standards, with the latest measurement technology for the most accurate, reliable and reproducible data available. The automation systems allow for maximum unattended laboratory productivity in all test environments. Relevant ASTM, DIN and ISO standards are easily met, as are demands for advanced testing, making these instruments the ideal choice for quality control, analytical and research needs.

Every rubber rheometer and viscometer by TA Instruments is built with an ultra-stiff testing frame and crosshead which eliminates the effects of instrument compliance on test data.

Large diameter steel rods and a thick crosshead brace in the H-shaped load frame provide unmatched rigidity to resist instrument deflection while the motor deforms the sample. This special design ensures that the commanded strain is achieved with each cycle of deformation, even for highly filled, fully cured rubbers. Additionally, a non-compliant system allows for truly sinusoidal strain profiles under all conditions. This can be verified by continuous Fourier Transform analysis of the deformation and measured torque signals which is available in the Scarabaeus Software. The superior design also guarantees smooth travel, proper alignment and precise application of vertical load.

TA Instruments introduces a complete line of new instruments for the measurement of rheological and physical properties of polymers, rubber and rubber compounds at all stages of manufacture. The new rubber testing instruments include a Rubber Process Analyzer (RPA), Moving Die Rheometer (MDR), Mooney Viscometer (MV one), Automated Density Tester and Automated Hardness Tester.

The RPA flex provides the highest quality of rubber rheometer data in a user-configurable platform, making it the perfect fit for labs that need more testing capability than an MDR alone can provide. The RPA flex includes all the same high quality features of the RPA elite, including ultra-rigid test frame, variable direct drive motor, proprietary high-stiffness torque transducer, precision temperature control with optional cooling, available Autosampler and powerful Scarabaeus Software for control and analysis. The Base level model includes a wide continuous strain range and fixed frequency enabling all MDR standard cure testing (ASTM/ DIN/ ISO). In addition, the RPA flex can be configured to include, or be upgraded to include, any or all of the features of the RPA elite including variable strain, frequency, stress relaxation, advanced oscillation, LAOS testing, and sample pressure measurement.

The RPA elite is the most advanced rotor-less rotational shear rheometer dedicated to the complete characterization of polymers, rubber and rubber compounds at all stages of manufacture. The RPA elite provides invaluable viscoelastic data on materials that are uncured, through the curing process, and in situ cured materials. The ultra-rigid test frame, high-resolution variable direct drive motor, ultra-stiff wide-range torque transducer, and precision temperature control provide the most precise and accurate torque, viscosity and viscoelastic properties of elastomers over the widest ranges of testing conditions. The full flexible architecture of the RPA elite enables advanced testing capabilities beyond any other rubber rheometer including: complete post cure viscoelastic characterization, fully programmable sealing pressure, large amplitude oscillatory shear (LAOS) and arbitrary waveform deformations.

Shore A hardness measurements are based on the precise application of force and the subsequent measurement of probe displacement.

A 12.5 N weight is applied to the measurement device that consists of a hardened steel probe of a prescribed shape. The measurement is performed multiple times, with the sample being rotated automatically between measurements to ensure representative sampling. The individual values, and the mean and median for the specimen are reported for each.

Powerful direct drive motors apply precise deformation in all TA Instruments rubber rheometers and viscometers. A high quality rheological or dynamic measurement relies on the precise application of a constant rate, step or periodic deformation. In a direct drive system the start-up delays eliminating compliance and translational losses, seen in clutch or belt-driven configurations. This superior motor design ensures that the most accurate and repeatable deformations are always applied to the sample.

The RPA elite, RPA flex and MDR one rotor-less shear rheometers employ the industry standard sealed cavity biconical die design. The dies are constructed from durable, high-stiffness, low thermal expansion stainless steel to minimize system compliance and prevent gap changes with temperature. The test fixtures are connected directly in line with the motor below for precision deformation control and the torque transducer above for accurate measurement.

Direct contact electric heaters mounted within the dies provide exceptional temperature control and stability under isothermal, step and temperature ramp conditions. This highly responsive system returns rapidly to the programmed test temperature upon the addition of a cold sample, providing the most representative values for scorch time and other cure characteristics. Extremely durable user-replaceable seals provide absolute sample containment at all temperatures and conditions.

Sample preparation for the RPA, MDR and Mooney instruments is made safe and simple with the VS Volumetric Sample Cutter. This dual-action pneumatic system allows for the preparation of uncured rubber specimens of a user-defined volume.

Preparing samples in this well-controlled fashion reduces operational variability, greatly improving overall experimental precision.

The VS comes standard with a closing pressure of 6 bar. The sample is first compressed to the user-prescribed thickness, then cut to the die diameter. The closing pressure and sample volume are user-adjustable. An optional booster is available to increase operating pressure to 8 bar, for highly filled and stiff materials. Two-handed operation and lateral guards guarantee safe operation at all times.

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